software update macOS Monterey 12.6.2

Monterey requires a Late 2015 iMac or later.

If you are having trouble connecting to websites with your older version of Safari, you probably just need to try it with a newer third party browser that is still being updated to meet current internet security protocols.

Internet security features continue to evolve and older versions of Safari cannot negotiate secure connections with newer sites.

I suggest you take a look at Firefox browser or Brave browser.