The things I never tried: giving up caffeine completely, eliminating sugar completely, eliminating carbs completely, losing 20 kgs (I'm a bit overweight like BMI 27).
What didn't work: Ritalin, Venvanse, Modafinil...
[1] I feel like it could just be "stress" ie don't know how to relax and let go (beer does work but I wake up worse). I cling to small stuff like "will my wife remember to pick up the clothes later?" (making up a real example that has zero bad effects if it doesn't happen today)