Please unlock all arena and dungeons for all players. Arena should have a matchmaking system based on MMR or matchmaking rating so it will be more competitive. As for dungeons please unlock it by not having do to PVP so some players may farm, earn by selling NFTs because its hard to get into the arena 1 since there are few playing there?

Example for arena with MMR ratings

Arena 1 - entrance fee 0.04USD

Arena 2 - entrance fee 0.16USD

Etc... With MMRs