I have the same MacBook 2012 / i7 - what a workhorse - still got the original battery and running Mojave like a champ - Best Mac product i have ever purchased 👍
probably worth looking at upgrading the RAM to 16 gig to max out the memory especially since you have 2T SSD
I also have another MacBook Pro 2015 it was running Catalina and now Big Sur I honestly don’t see any advantage to switch the 2012 to either macOS especially since it’s not supported on a 2012
I’ll be leaving my 2012 on Mojave til’ the very bitter end 😃