This is really important. And especially for writing.Be prepared to learn how not impressive your best ideas may be to others, regardless of how sure you are about them.
Everybody these days think they’re awesome writers, but more often than not it turns out to be just heavy reading and pretentious purple prose that puts the reader to sleep in record time. It’s deceptively easy to put fancy sounding words on paper, but it’s waaaaay harder to structure those words to become interesting and entertaining.
I’d buy some design tools (those are relatively cheap these days and readily available) and try to make a small game of my own as a proof of concept, if I had it in me to try and get in the industry.
(I still might make that game for hobby purposes somewhere in the future, as basics of coding is part of my studies.)