My only advice:
Learn what you want the game to be and then focus on that completely. Don't let anything change that. Not feedback, not suggestions, not content polls. If anything goes against what you have in mind for the game, ignore it as if you never read about it.
Too many games, especially Pokemon H games, get completely sidetracked by random ideas (both by the fans and by the creator themselves). Make a plan, stick to it, additional stuff can always be added once the core game is complete.