If you have Apple Intel hardware, I strongly strongly strongly recommend you migrate to Linux. It works amazingly on MacOS, except I guess the sound drivers aren't perfect. Too many security holes in old, unpatched software.
At this point it would be better to migrate to a new MacBook. There has been a lot performance and efficiency improvements with M1+.
I second that. I wouldn’t buy an Intel Mac specifically to run Linux, but my T2 Mac Minis work well for me on Linux. I did have to copy some Broadcom firmware from macOS, and I keep a small macOS installation in order to access recovery mode settings.