I 'modded' my steam deck a year ago and want to undo it

A year ago I followed a small turorial on how to insteall PS2 games on my steam deck using Pcsx2 (which I was told was better than emudeck), but now I have the dilemna of wanting to start it all again, how can I delete everything and start over with a fresh coat of paint?

Basically I want my steam deck to be returned to its original state, is that possible? Thank you!