Same here! I'm bummed that Catalina, the last OS update to officially run on it, probably will hit EOL in 2022. I'll likely begrudgingly replace it, rather than look into workarounds to install newer versions, in an unsupported and slow way.
You could install big sur using some patch if you don't mind the built in wifi card stopped working, but I heard you can swap the wifi card from later model and big sur would recognize it.
