Then do you mean you synced your local data to the wrong OneDrive account then?
For me I use OneDrive so signing into the wrong OneDrive account would mess up my cloud data.
I have all my accounts synced to my PC on Windows 11.
If you did a clean install then no local data should be affected.
Just switch over to the other account in the start menu after you add the account.
"Dell" has a local account on my PC also. I figure that's for them to use if I call upon them for help.