If you haven’t already, I would try a different distribution and desktop environment. In my experience this made significant a difference. If privacy is important to you I would not give up on Linux.

Other than that. Do not login with a MS account, debloat the heck out of it, etc. I can’t help you for any advanced configurations, however, with some basic searching on the internet I found some articles that gave good tips. Do some research on that, you might learn a few things.

If you want to take things a step further you might also look into changing browser, search engine etc. But that’s a whole different topic.