How to delete past mistakes and start completly over?

So basically I just starting to get concerned about my opsec, and looking back to what i did on some dnm i would want to do things the right way.

First of all, i used my main os, just a normal arch install whit every personal account on(games, mail, work) and tor.

i didn't use any vpn when browsing dnm, and I wasn't really so discreet about it too. so now i find myself with everything togheter on the same os, and i jsut want to start completly over, but I would like to delete as many evidence as possible, any tips?

Aslo for when i start over i was thinking of jsut a fresh install with whonix and mullvad, would it be ok to use whonix to browse the dark net and use the os normally for personal stuff?

Just new everything. New PGP keys, new logins, use KeePassXC. Learn the lesson and move on.

I'd just make any linux live USB and nuke all the drives in that PC. Reinstall whatever OS you want. And do all DNM and shady related stuff on a TailsOS USB like a normal person. And indeed; delete all dnm accounts, pgp keys etc. is KeePassXC the same as Secrets on Tails?

Yes that's right they changed it on Tails - Secrets now

do i really need to go woth tails or could i just go with whonix?

not much to it. new tforum, DNM and whatever else acounts. use emails like cock.li or shit like that. new compuiter, run tails and qubes (tails is sufficient for buyers) and new PGP and all that bro. a whole new online persona. ive had to do it multiple times just destroying my paperwork and losing keys in a pschotic episode lol from the outside looking in ur a totally different person nobody is the wiser

If you're doing purchases and shady shit like that: Tails exclusively. Security and convenience are mutually exclusive