I feel for you, as I am in the same position. But if you have been reading items regarding automatic updating of Windows 10, you will come to the conclusion that updating is inevitable.  Even Windows Secrets blog is suggesting there will be no further upgrades to things like Windows 12, just installed patches/fixes which will record progress towards a perfect product.

And to seal our fate, Microsoft are going to be able to force updating apon us. The solution is bleak, but not impossible. We have to report problems to Microsoft and hope that somewhere in their future, patches etc they will solve our issues.

Martin

A main issue with Win 10 is the endless automatic updates, often quite major, that keep coming.  Pegasus was going well on my system until a late October update slowed everything to a crawl, and the problem was solved by a system restore. to just before that update (30 October).