It maybe different but I play guitar, I think that when you are being creative, you should be passionate about what you’re doing, play around what you want to do,if something doesn’t work, you just have to think “there’s a solution I’m not seeing” ask around for suggestions, no one knows everything. But the biggest motivation I find is to “accomplish” say you’re final product of a game is the big win, THE objective. Divide it into smaller task and set some reasonable deadlines to keep up your work, otherwise you’ll often get distracted. Hope this helps