Returning from a printing hiatus -- Must have upgrades for old SV01?

I have two SV01s that I haven’t dusted off since moving a couple years ago. Before I stopped messing with them, I upgraded to the silent board and BLtouch, and whatever the latest version of Marlin was at that time. Wondering what new “must-have” upgrades there are now…I’ve overheard some coworkers talking about sonic pads and linear rails, but I figured I’d ask people in the know before I head down those rabbit holes.

Thanks in advance!