Pretty much all steam games that don’t have secondary DRM can be made to be steamless with tools like the Goldberg emulator (Disclaimer this project is meant for games you own and have permission to replace steam on, it’s not a piracy tool, but you can use it to archive installed games). PS5 games are two decades out, at minimum, to be emulated.

Thanks to collectors and scalpers, the secondary games market is pretty much nonexistent for modern consoles. So reselling isn’t going to get you enough to buy anything really.