Running rootless xorg recently got my Plasma to black screen after a min of launching sometimes, couldn’t switch to a tty (I could press the power button and it worked so ig only the GPU driver crashed or something) the problem most likely only aroused when I adjusted sddm settings from Plasma’s, which created a new sddm configuration file, removed rootless xorg config and it seems to have fixed it

I remember being able to create a persistent drive using Rufus and Linux Mint (Not the Debian edition though) , Rufus has a slider for creating a persistent drive when burning the iso, pretty sure you can find some guide online