It just occurred to me: you keep talking about winning gold, were those contests the official ones organized by Deca?
In that case then yeah, you’re not going to get much constructive feedback from there because that’s not really the point. The idea is to organize events outside of the game so that the players will be doing something together other than merely playing the game.
It’s a really basic marketing trick: make you forget that you’re an individual who happens to be one of their customers and make you believe you’re part of a “community” instead. It’s so basic even youtubers are doing it.
You should probably try to look for art communities where you will be able to participate in actual discussions and receive feedback on your own stuff as well, that’d be more beneficial. Or if you don’t actually care that much about art, do literally anything else with your free time.