buy him a personal indoor trampoline for xmas. bouncing is a sensory soothing mechanism for them and they are usually used in physical therapy

I have a bouncer as well 🐎

Small personal trampoline mine used to jump in hers but my daughter Is so tiny she couldn't damage it. We have one of those 3 in one cribs it's a day bed now we got a secondary set of rails for her bed

We keep my son's mattress on the floor. I am not sure if it's helping it last longer but he is very big and I worry about him slipping is the main reason. I think it helps the mattress last longer. My son is nonverbal and we have not been able to change the behavior but you could reward him for a day or few hours without jumping on the bed if there is something that motivates him.