I need to upgrade an old mac mini 2,0 to the highest possible version of OS/X

Currently it is running on Snow Leopard. That is so old, that I cannot even get a decent browser to run.

https://everymac.com/systems/apple/mac_mini/specs/mac-mini-core-2-duo-2.0-specs.html

1) To which version of OS/X could I possibly bump it?

2) How should I do it?

Thanks for any pointers into the right direction...