Whatever you're interested in. Seriously.

Don't try to pick a job based on arbitrary metrics. You need to pick something that you'll be interested in doing, because you're going to be doing it five days a week for a long time.

Start with something you're extremely interested in, because you're going to need that natural interest and motivation on your side.

FWIW: ADHD diagnoses aren't all that rare in 2021. You'll find people with ADHD diagnoses in literally every job out there. Don't try to build your career or even your personality around an ADHD diagnosis. The diagnosis is just a tool for helping you navigate your mental health, not a defining feature of your personality going forward.