The Hub in the Hive is a pretty boring place. The only reasons you really have to explore is for the “Dora the Explorer” hub title and places to roleplay. I think that there should be more in the hub for players to do.
There could be a completely new hub that is much bigger and has many secret places. There could also be places in the hub only for Hive+ (as mentioned here.) There could also be spots you can only access based on your statistics.
Some places there could be is a Hive+ hangout, secret parkour places, cool caves that go underground, and really cool builds you can explore hidden. There could also be puzzles.
All of these could give you cosmetics. This could add different hub titles, avatars, and even costumes to the list of cosmetics.