congratulation to your prestige10. you may start to open kegs to collect premium legendary now. My rule is, always pick the premium 5th card (the left one) because I want MP over Scrap. Maybe you can do so.
It will take a while for you to reach the next prestige. but I recommend to play with less than normal speed. because after I reached prestige 11th for a few weeks, I concluded that the final prestige (11th) reward is is "you won't get any XP forever".
But Prestige 11th is so demoralize me to play Gwent. I mean I won't get any RP from level up anymore and if I want RP then I have to collect CP which is 24cp for 2 rp. it's not easy and take a lot of time. ;_;
Actually, Prestige 9 is also meh (10mp when complete a daily quest is less than 1 RP. It should be 30mp instead.)
I hope CDPR aware of this and tune it up. (for example, 30mp / daily quest for prestige 9 and 1 rp for every 3000xp forever for prestige 11. The level is just zero or double zero which means infinite)