Why don't you try practicing your art with the game drawings? also, do you have a patreon or subscribestar to help you to continue this project? of course if it is posible for you.
also I have the same brain problem (I think the name is a BrainStorm) , when im drawing i also have writing Ideas, so while Im drawing i write words (just words, not complete sentences) on the sides of the drawing. so when im finished, I read the words on the paper and i got one idea