Here’s an outstanding article on the subject that I believe can help give you some guidance from one of the most widely respected strength coaches out there
I think it depends on the exercise. We know that once we’ve earned the muscle it’s super easy to maintain, especially if you’ve held it for a while. There was one study that showed 1/9th of the volume could be enough which is quite insane.
I would probably do something like
5x3 on squats (with something I could do 5-6 with), focusing on a fast concentric, slightly slower eccentric. You don’t wanna hammer yourself with overly intense sets if you’re worried about your CNS)
Bench Press 3x3 maybe a little more intense but be sensible with it
Everything else just 3x3-6, autoregulate it, don’t limit yourself to a rep range, if there’s an easy rep there you may aswell take it. With something like deadlifts I might use only 70% and do multiple sets of 6 to get the pattern in.
You’ll likely lose top-end strength whatever decide to do, but that has the potential to come straight back if lifting ever becomes more of a priority.