I haven’t competed in a while and even then I only went to like two meets where I placed. But since nobody else has jumped in here goes nothing.
I used a lot of kettlebells. Swings, snatches, presses, in between doing heavy triples and heavy singles on my main lifts. I found it helped loosen me up and help prevent muscle soreness. This was in conjunction with a 30-45 min full body warm up ( body weight exercises at 8-10 reps) and a 30-45 min stretching session at the end. I never took any supps for it apart from pre-workout and protein (of course) BCAAs and some unflavored Glutamine mixed.
Back then I was about 238lbs pressing 315, squatting 395, and pulling 525lbs. (I’ve always had bad knees).
Hope it helps, good luck with the meet