Is there any drug/herb/hormone that increases motivation, focus, reduces ADHD
My two cents: start with examining your hormones, exercise and diet. For me at least, these are all HUGE. As you've probably heard me preach, both T and DHEA have gotten rid of a lot of anxiety, depression and mental fog. If you can get rid of those three - depression, anxiety and mental fog - then you are in excellent shape.
I eat a super brain friendly diet - lot of berries for example - in my opinion and I also eat to maximize blood flow - also uber critical for the brain. The brain is packed with ultrafine capillaries and you have to avoid brain rot and brain calcification if you will.
Exercise is also incredibly huge. If you don't over exercise and do it just the right intensity and duration, you will feel fantastic for HOURS afterward.
Nutrition is also very critical. The brain needs a beefy supply of minerals and vitamins to function properly.
Checking cortisol and thyroid hormones is also critical for some men as well. Same with progesterone - the catecholamines and so on. So start pulling some #s if you haven't!