Design a new testing station with 4+ new enemy types (make them actually dangerous) and new layouts that are longer than the others
Put one of these testing stations in each zone, including the radiation shitheol
Put 1-3 nodes in each (near the end post id bracelets so you can't speedfarm them, these don't respawn until the entire thing does) that can be titanium or stravidium
Put boxes that contain sprinkles of t6 components
Figure out a way of dripfeeding t6 schematics (do not put ANY spice in these)
Make them not reset until you've completed all of them, then waited some amount of time (an hour maybe)
Make them doable solo or in parties only, and fully instanced so some faggot can't sit in the chest room and click on people's heads with a swallowdart

Congrats, you now have a farmable endgame for PvErs to continue playing forever
This is how every reasonably successful pve game with loot handles end game
There's a reason why the STILL LIVING games have replayable content that isn't forcing you into pvp or literally 90 straight miles of holding W straining your eyes looking for turds on a rock

Also make a new unique sandbike tread that has massively reduced wormsign generation