This might be a controversial opinion, but learning how to relax has been the best thing I have done for myself as an AuDHD person (other than getting diagnosed and medicated for ADHD).

Finding activities that work for me (breathwork and movement; edit: also music) for switching from busy to relaxed and back was super important.

And learning how to recognize when I’m about to crash earlier and earlier so I can do something about it.

I also really like the concept of the dopamine dial, where you turn the intensity of dopamine-producing activities up or down depending on what you need.