Add a "Join random world" functionality/button in Random Worlds subtab of Worlds tab that would instantly teleport you to a random world. This would be a fun feature that sounds easy to implement. The button could be placed e.g. next to the "Shuffle" button in that same subtab. I believe this feature used to exist a long time ago.
(Maybe even add one for dropping random portals in case you want to go a bit wild with friends?)