I have ADHD but I hit 1800 elo on my other account in less than a year starting from 200 elo. So don't blame ADHD. It's either A: You're not intellectually equipped to play chess. Or B: You don't put in enough effort.
ADHD is on a spectrum, different people with ADHD have different challenges and skillsets relating to their ADHD. It's not a one shape for all. You can't claim because others with ADHD do well that it isn't to blame, that is entirely untrue and lacking understanding of what ADHD is and how it is across the spectrum.

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