I have also struggled to have a successful projection, but I've done my fair share of research for ideas. Let me give you my two cents:
Psychedelically speaking, that would require the use of drugs like marijuana to enter a deep trance state of being. This idea may not allow you to have a "true" experience, because you would be under the direct influence of a drug. I can't say for sure because I don't smoke marijuana or do any drugs. That is just what I've read. Also, if you chose to attempt that way, that would put you in possible harm or risk of legal trouble. I wouldn't recommend that.
To snap yourself in that state, the root cause of astral projection stems from being in a deep trance. Sadly, we can't just take a magic pill and suddenly "snap" into the astral realm. It takes loads of dedication and practice to accomplish. I do have a great book if you'd like the title. It gives you several different techniques and it explains how to do them. Make sure you have no fear whatsoever. That will end your progress the most. Don't try to force it, either. Practice deep breathing/ Try listening to Theta and Delta wave binaural beats. You can find a bunch of it on Youtube. Those help me immensely to reach the vibration stage. I hope this helps you out.