I don't know if this has already been suggested but I remember a while ago when certain game modes had different hubs/lobbies than they do now, each one with different parkour map(s). I saw a lot of requests for new maps and thought this might be a good addition. Bringing back those maps to the parkour game mode might keep players satisfied for just a bit until a larger update is released. After all, those maps are already built and can be ported over to the dedicated parkour game mode (I think).