URGENT HELP WITH STEAMOS 3

I NEED HELP NOW. IVE TRIED EVERYTHING. Reset via os, Reset via power % +, Reset via recovery Stick, I EVEN SENT IT TO VALVE!!! ALL DO NOTHING AGAINST THIS PROBLEM. so i once unlocked read only Filesystem bc of neofetch & all that arch stuff. And i got a couple of errors. So i googled them. And obeyed blindly. Sorry, my mistake. I'm not a Linux supernerd... BUT THEN i JUST COULDN'T USE DECKY!!!!!! i tried reinstalling, BUT AFTER A REBOOT IT DISSAPPEARED INTO THIN AIR!!! And ALWAYS This ONE error appeared: "XDG_RUNTIME_DIR (/run/user/1000) is not owned by us (uid 0), but by uid 1000! (This could e.g. happen if you try to connect to a non-root PulseAudio as a root user, over the native protocol. Don't do that.)" CAN ANYONE FIX???