Exercise, exercise and more exercise - I mean heavy exercise, sweat it out! Intense exercise stimulates your neurotransmitters and promotes the production of new ones. After I roll I typically do weights/run, it just makes me feel so much better. If you're lacking the energy/motivation you've just gotta force it.
Thats my main suggestion, others include:
- balanced healthy diet rich in L-tryptothan (carbs) not only good for energy reproduction but also serotonin replenishment.
- 5HTP & vitamins (Vit C in orange juice is neuroprotective and good for reducing any neurotoxicity).
- Socialising with close friends.
- Re-playing songs that were on while you were peaking - it often brings the euphoria back - pretty cool!
Personally I wouldn't recommend smoking weed, it just makes me lazy/anxious, but if it works for you then do it. Staying drug-free for the comedown is much better IMO.
I cannot stress just how good a heavy exercise sesh can make you feel - try it!
Hope this helped.