2-3 sets on monday, on friday go for a PR, if you hit it then increase weight for next monday and repeat
ie let's say you can do 200lbs for 8 reps all out
then on Monday do 2x6 with 200lbs. Control the negative, make it slow'ish and no bouncing out of the bottom, stay tight. rest 4-5 mins between sets
on Friday try and set a new rep PR with 210lbs, if you can hit 210lbs x8 or more
then use 210lbs for 2x6 for next monday's workout and repeat
add some core, single leg and posterior chain work after the squats, like bulgarian splitsquats, RDLs and GHR etc. Nothing too high in volume or too heavy, close to failure. Just 2 sets of each is enough, even one maybe enough, it is for me
add some walking or active recovery work on off days, and some foam rolling/self massage tissue work to keep your fascia and body functioning properly and clean up scar tissue and adhesions in your msucles and your golden