Create an additional slot at the map room for a craftable obelisk. The craftable obelisk could be placed anywhere, and each player’s map room(s) would teleport to the crafted obelisk that was most recently attuned.
The cost should be very high: something along the lines of one (or several) of each boss item, 1000 Star Metal Bars, 1000 Obsidian Bars, etc. For the endgame when people have done everything else.
This would be nice because it would allow bases that are far from any current obelisks. Right now, there’s an incentive to build near one because you can move around; with this, you would get one additional base anywhere on the map that would be accessible.