What kind of ideas are you looking for? Ideas about the game or ideas for the Discord? Would happily provide for both
You could always hold a poll. Make an announcement for fans to submit designs that they want to be in the game. Have it be a one month time frame for submissions. Making it one submission per person and then have the fans vote for the ones that were submitted. Top five or however many you want will be implemented in the game for all. Would be perfect since the anniversary of the game creation is coming up.
You get ideas from the fans and they get to participate in the creation of the game. You could even implement it to where designs may be new enemies to face.