Maybe see if he can help you in the house a bit too now he's 11. Then you will hopefully both get some down time.
What you need may vary. Could be a chill with a book. A walk in the fresh air, catch up on a programme, watching toktoks, crafting something, having a face mask, doing a foot peel etc. For me, maintenance of my body feels like a chore so those are the things that get abandoned but I appreciate when they're done.