I am not that much of an expert. i don't play over rank 18 for now but from what i grasped from the game in the later ranks you deffinately need twists in your deck and tech againts the most common archetypes.
As for improvements i think you should start with changing the leader first if you want to keep those forms of removal they kinda don't work great with your leader i can recommend King Radovid V.
Your deck needs some identity ( i mean it plays the big value cards from various archtypes ) there are some negative values you can clean that come from Sigismund. I mean there are cards you better not play with him he is obviously the clan powerhouse.
And since you are in a budget i can recomment you Muzzle and Scorch. Just becouse they fit in all decks. They are kinda boring choises but they help you climb if you know how to paly them. By playing those card correctly you can get wins no matter that deck you are playing and they play in all decks.
Most people suggest you to play the armor deck since the armor is natural counter to weather decks and removal decks so its very effective when you are climbing the higher grinds. Since there are lots of control decks especially ciri nova decks and you do't have any tools to win againts such deck.
Also you can play a deck with less than 6 silver cards i see Roach that is a card that begs to be replaced with a bronze card
. And you run powerhouse cards but you don't run the silver value cards that hurts your deck a lot. Don't focus that much on the golds but on the silvers they can give you the extra twist you want in your decks.
THALER the 13 power spy every faction has one such unit they are very powerfull craft it after SCORCH. The way you play those 2 cards will give you plenty of wins they are in every net deck. I know you don't want to make a net deck but checking them is very important it will give you understanding againts what you will be playing since everyone will netdeck. This is how you make decks with a twist by knowing what people play and outplaying them with cards you find valueble in this position.
Lock status instead of hard removal- Great swords you have seen them. Hard removal is useless. This is why i recommend you using king Radovid instead BUT if you insist on keeping Foltest there are some card combos you can consider when playing him since they work the best with him (Odrin -he is lonely powerhouse; lubberkin-botchling; Lambert-Eskel- Vesemir( they are great at slimming your deck if you don't have the nessesary silver cards and with sigismund and stenis they help you out a lot with playing your whole deck
) And don't use cards that don't have boddy(A.K.A cards that are units not spells and items) you want the max stats when playing a card
Vandergrift's blade is the best silver card in this faction. since this faction is the only one that does not have a silver unit that toogles lock status. And its the best silver card i have seen you can even consider archtype that will abuse it. SO abuse it
.
Bronze cards - This is what i mean by your deck identity you curently run armor deck with the wrong leader. Reaver scout is amazing card for your leader it lets you play 3 more cards from your deck and wit hthe deck slimming from the other strong cards like sigismund and Stennis it wil lgive you value if you play the 3 witchers and the Silver swords those cards wil lgive you great value especially from the deck slimming it will alow you to play al lyour gold cards where your oponents may not have the luck to draw theirs. And one of the reasons Kiri: nova deck is one of the top net decks but you need extra value for her.
Tormented mage and the thunderbolt and air's thunder should go home in your deck case. Although tormented mages are core part of the armor deck you don't run neither the leader nor the cards to support them. You need better removal if you insist on keeping your leader use diametrium shackles this season they are very usefull Run 2 of them since every deck runs their silver lock unit and they can unlock whatever you deside to lock and consider mulliganing them alway if you don't have enough removal.
Kaedwani sergants don't have place in your deck honestly. I see why you are struggling with the weathers since you are running 3 deck archetypes into one. I get why you should want to play the powerhouses of the Clan into one deck but that is why Ciri : nova decks exist that extra 23 points you get hrom her are the thing that makes you competitive for not playing all the suport cards for your powerhouses since they overal get more value from proper silver card.
Right now you are playing Armor type deck mixed with the deck slimming from troop swarm decks and ciri: nova decks combines with troop booster decks but you lack the low value support cards from those archetypes and its why your decks fails at climbing.
Redanian Elite and Redanian Knight are the armor decks core cards they give you extra value from other armor removals and they are natural protection againts weather decks since weather takes time to catch up the value you losef rom having a turn where you played 6 power combo of 2 cards to spawn the weather. and by the time the weather breaks their armor they just refresh or boost themselfs so you don't need to run clear skyes or weather clears. And considering you run clear skyes in your silver cards its too much. The cursed mages and thunderbolts are suport for your redanian knight elects. In armor deck those cards are not the main stats income they are just suport cards for the archtype you gain the most value from breaking armor and your deck lacks proper suport to gain value from the knight-elects and you kinda rely on that to overcome the netdecks with the best card synergy value. And they are very valueble in your deck archtype.
Also the lack of the core armor cards starves your vincent out of value considering i you ever draw it. or even worse draw it in the worst moment from sigismund leaving your board defenceless and vulnerable to all sort of evil things.
Seems to me you need more understanding of the meta and what is good. You lack colelction too But if you are not into netdecking check out the Troops swarm deck its uper fun and not that much explited. Ciri: nova decks are this month's top decks and she can b erun with every faction and its a fun experiance crafting such deck you can make it work with smaller collection so i you are looking for a gold card to craft she is a good choise for you and she is especially strong in the northerners deck ( so strong in fact Armor ciri is THE STRONGEST deck for now ). So when you reach that pint where everyone is playing ciri deck you will apreciate Scorch and the 13 power spy. I thought they are not that good but they are a must.