Practically speaking, I think that our single best psychopharmacological bet for tackling depression, anxiety, and above all chronic pain worldwide in the next decade is to:
1) Identify great, non-toxic, partial mu-opioid agonists with extremely high therapeutic index (e.g. tianepetine, 7-hydroxymitragynine, etc.), and
2) Prescribe them in conjunction with anti-tolerance drugs (such as proglumide, agmatine, black seed oil, small dose ibogaine, etc.).
I think that whomever manages to patent a mixture of partial opioid agonist + anti-tolerance drug that works in the long term will be a multi-billionaire within a couple of years while actually reducing/preventing massive amounts of untold suffering.

Proglumide: A Promising Anti-Tolerance Agent (proof of concept of what is to come)
Ps. My core research at QRI is not pharmacological but rather phenomenological and “patternceutical“. So I am not pursuing the above line of research myself as the core objective of the next few years. But if I was looking into pharmacological options, that’s where I’d shine some light on. If you are in the field, I urge you to look into this option. For more info: “Anti-Tolerance Drugs“.
What is the current best contender for the “patternceutical“ approach to bliss? TCAS? TCDS? Some noninvasive method such as trans-cranial therapy altering brain wave patterns to achieve greater harmonics?