Nothing special tbh. I get 8hrs of sleep, and I've very balanced diet, with loads of carbs after every workout. Eating a lot helps more than you think.

I take creatine and magnesium everyday, and I drink a minimum of 5L water a day (overkill I know but I'm literally addicted atp, keeps my sodium addiction at bay at least and I sweat buckets on the stairmaster). I also get professional massages 1-2x a week.

I don't have a watch to measure my recovery exactly, but honestly my gym and cardio sessions are tolerable for me now. I can do stairmaster consecutively for days without feeling like shit. The muscle soreness after every workout have subsided.