Adderall, weed, music, a whole lot of time outside, and giving as few fucks as possible.

Medication eases/fixes most of the function-impeding symptoms, which in turn helps with imposter syndrome, etc. The rest is really just self-care.

As another user pointed out, though, I also stopped trying to "mask" at all.

Realize that nobody is "normal" and most people are a lot more fucked up than you realize. Almost every single person you interact with on a daily basis has some kind of bullshit going on that makes their life difficult. Depression, anxiety, addiction, financial problems, relationship problems, health issues, you name it. For the most part, people are far too focused on their own shit to care about anyone else's.