It sucks ass that there’s no long-term solution for ADHD. Just temporary fixes that rapidly stop working.

There is exciting research being done in metabolic psychiatry looking at ADHD in fat adapted people. There is a ongoing study (https://doi.org/10.1186/ISRCTN62698625) but there is a good expectation they will see sustained results, this is inline with Dr. Georgia Ede's metabolic strategy in Change your Diet Change your mind. The study authors gave a interview 2 years ago - https://www.youtube.com/watch?v=sUAbqXcSAzg , so maybe we will see the results published soon.

infographic of change your diet, change your mind

TLDR - metabolism and brain energy appear to be the core of many psychiatric conditions, so its worth trying a fat burning metabolism for 30 days and see if it improves your ADHD.