Collapse... Your game has a awesome engine for... anything. What about Escape From Tarkov idea for this DLC ?
Random spawn somewhere (far enough from other players), collect stuff into bags and pockets. Try to Escape from location in random escape point with all your stuff. Everybody knows escape points (as a list). Players too. But they dont know YOUR escape point. You can select stuff for your start point that you should BUY with money you received from previous R.A.I.D. Can you? Will you collect stuff or try to hunt stuff-carrier? Do you want to lose all your collected stuff (include stuff you bought before) ?
Tarkov - top-1 first person shooter on Twitch. Top-1 for last 2 years. Why not?