I don't have any evidence of this but I stronly suspect that doing regular meditation will reduce the chance of bad trips or atleast let you deal with them much better. I'm saying this in case someone decides to experiment with DMT or other halucinogens, you should seriously consider trying meditation as a prerequisite.
Anything specific practices you recommend? I'm not interested in ayahuasca, but meditation has been on my list for a while now.
The main goal of meditation is to think of absolutely nothing, and focus in the present.