It's beyond my expertise, I can't generate a state which simulates a clean slate, except buying a new phone and registering a new google account along with it. And barely then, I'm sure they catch on very quickly.
👤 mathematically Accepted Answer ✓
There is a firefox extension called containers (https://support.mozilla.org/en-US/kb/containers) that can be used to isolate different accounts. So if you want isolated accounts then containers for different accounts will help you do that.
👤 smt88
It has a lot of recommendations of vlog garbage (essentially reality TV). Truly awful.
It also has a lot of current events, like sports and news.