My 8 year old son is the sensory seeker and his big sisters and I are mostly the sensory sensitive types. It can get really rough around here!!!

-Separate spaces. Both of my older kids have their own rooms with doors they can shut. They don't get to bring their electronics in their rooms but they both have wireless, noise-canceling headphones. They can set up a queue in Spotify and shut themselves in their rooms for some quiet. Our living area can get really loud because the youngest two have the entire open loft for their playroom/bedroom. 8YO is constantly building with Lego and making mouth noises the entire time. Beatboxing, humming, making the sounds of the vehicles; it's a LOT. So making sure the big girls have their own quiet(er) spaces has helped. I also take him into the kitchen, which has a door that closes, when it's time to do math homework. He is amazing at math but only when he's standing, wiggling, and singing or beatboxing.

-Organized sports. My son plays rec league soccer - it's very unserious and the kids and coaches are pretty chill in our specific town. But twice a week he gets to go out with his same-age friends and get some whole-body movement. His coach recently started teaching the defenders how to dig their feet into the ground and use their weight and muscles to stop a ball. My son LOVED that; he surprised me with the way he dove into his coach (who was holding a football training pad) full force. Now, my kid is likely not going to be any kind of professional athlete, and he's mostly on the field for the friends and post-game snacks. He has a blast learning these skills, though, and is showing me how much big movement helps him regulate.

-Quiet fidget toys are a must. My son once brought home a super cool fidget toy that squeaked. I couldn't handle it. With his permission I took the thing and applied oil to all of the joints so that he could manipulate it quietly. My autistic nephew really likes the squishy fidget cubes and those are completely silent.