Malware bytes is OK. I used it a lot before I went to Win 10. There is some criticism I read lately about it in comparison to some paid services as I was considering returning to it but I think, for my peace of mind, I'll pay (this time). I could change my mind between now and October 24. Note that I never had a problem when I used MB.
I'm sure my system could run Win 11 but I'm reluctant to risk it as parts of my overall system may become obsolete and non-functional faster than remaining with the [near perfect] system as is.
"But that may be why I keep seeing the cry of doom from folks who seem to believe that once the support stops, bad things will happen to everyone who doesn't switch over."
This is likely great marketing and subversive Redditing and Quora'ing by MS and of the worrying of the suggestible.
There was word that MS may offer 'paid for support' for a limited time after end of support. But that potential just shows me that they had built obsolescence into the thing anyway. I'll also be considering Linux.