Common sense.
All most anti-virus do is check for signatures. The best protection against malware is always being smart (not downloading random shit, not falling for phishing scams, etc...); I stopped using an anti-virus years ago and I'm pretty sure I never got any malware on my computer. It's honestly not that hard.
This, and dropping windows are a solid steps in the right direction... There is no reason to do any internet browsing in a windows, and much less handle money or crypto with it when you have
plenty of good and safe alternatives.