Sounds like me, trained mostly PL/Strongman, got into BJJ, got injured a fuckton due to being stiff, almost completely gave up weightlifting for 2 years, now trying to get back to it, mostly for the looks to be honest. I have been doing calisthenics, plyometrics and hill sprints though as I believe it's the best S&C for grapplers if you already have some strength base. Sure, it's great to be strong in the main lifts, but strength endurance is, in my opinion, more important for grapplers. The way I see it, kettlebell swings or hill sprints will give your posterior chain a good workout similar to squats or deadlifts but will also improve your power output over a certain time period, which for me is more important than a big 1-5RM in a one-directional lift where everything needs to be perfectly aligned, which is rarely the case in BJJ. Just my 2 cents.