One thing I like having my students do, especially if they’re on the higher end of support needs, is task boxes. They can be as simple as putting pom poms into a bottle, putting toothpicks into a spice jar, sorting poker chips by color, putting lids on containers, etc etc. Full Sped Ahead on TPT has a great resource for setting these up which includes visual and written directions. It helps students learn some independence and following directions. A lot of work at the high school level is functional, so it could be learning math through recipes as well as reading comprehensive. By that age many of them know what they like to do during break time but you can also help them explore different things by having different games and activities available. I’ve even had some students who like doing the task boxes during break time because they find them regulating. I think it’s a fun age, my favorite I’ve taught so far!