I've got several work accounts that aren't supposed to overlap, and recently a couple of sites started treating them like they belong to the same person. Different IPs didn't help, clearing cookies didn't help either, so apparently they're picking up something else from the browser or computer. I started digging into it and found out there's a whole browser fingerprint behind the scenes. Is there a way to replace all of that data so the accounts stop pointing back to the same device?
I'd start by checking what each profile is actually exposing before changing more settings. There are fingerprint checkers that show what a site can read from the browser, so you can spot the pieces that keep staying identical between accounts. That gives you something concrete to work from instead of changing random settings and hoping one of them does the trick.
The tricky part is that sites don't look at one identifier in isolation, they build a picture from a bunch of browser and device signals together. That's also why changing a couple of obvious values usually doesn't solve the underlying problem. It's worth reading how browser fingerprint spoofing works and why antidetect browsers are used for it here: https://gologin.com/blog/browser-fingerprint-spoofing-how-to-prevent-tracking/ (https://gologin.com/blog/browser-fingerprint-spoofing-how-to-prevent-tracking/) . The article breaks down what makes up a browser fingerprint and how antidetect browsers replace those signals across separate profiles. It also explains why the values need to look like they belong to the same device rather than a random collection of settings.