How can I remap enter key on MacOS big sur?
Try Karabiner
https://karabiner-elements.pqrs.org/
Although it says it's compatible with M1 macs, I dont know if it's ARM native or runs through Rosetta2. Any app that runs through Rosetta 2 thrashes the SSD with lots of writes (at least 4x more than M! native apps) Too much writing to your SSD can lead to senility of the SSD. The only solution to this is to avoid running non native apps through Rosetta2 (which makes  memory resident apps like Google chrome a problem)