I honestly don't know what that silence would be like. I've spent my programming career jumping between domains, becoming an expert then moving on to find a new challenge. Now I'm building AI stuff for medicine.
In my down time I learn languages, watch videos about physics and math, and play puzzle games.
My brain actually won't let me stop. Boredom = pain.
You sound like you're way smarter than I am, but I can absolutely relate to bordom=pain.
I'm constantly learning new things, or delving deeper into subjects I'm already familiar with. I can't help it. My brain won't have it any other way (otherwise I get destructive)
The edge to overoptimize yourself is very close and thats even more a hassle when hobbies become hustles and the brain doesnt distinguish anymore between work and hobby and freetime and me time.
Its a spiral which can lead fast to burnout or other related stuff.
Kudos to you that you made it this far and successfull in a challenging field.
I learned to sketch, and paint miniatures. It gave me some kind of silence. I have to study painting techniques also. So, if I want to keep my mind occupied, but not too heavy, then I could watch some painting tutorials.
As someone with ADHD with severe hyperfocus, I feel you. Just once I want to think about nothing. Even with meds, it only helps me defocus. Doesn't stop the thinking.