I will never doubt the experiences of people who have used entheogens in practice however I have not used them myself for magick. Of course this is because I used to abuse hard drugs and would like to not ingest these. Yet I absolutely believe in entheogens as amazing tools for magick.
However I would be one to caution against initially. Primarily since you’ve said that you haven’t had anything that’s worked yet, this could be a dangerous path. And that’s because you might become reliant on the drugs to need to perform magick. Of course I don’t mean addicted to drugs but you don’t want the situation where you can only do magick while trippin fucking balls. Like I said, I haven’t used drugs for ritual purpose but most of my friends that have usually warn about this.
If I were you I’d try to really take some time to understand why your magick might not be working and try to identify what points that might need altering. Put pen to paper and see with your own eyes what could be worked on. For me, to finally start seeing tangible results I had to understand that magick was going to become the most encompassing thing in my life. This means that I had to devote much time to both study and more importantly, practice. And I had to learn how to practice the right way for me.
That being said, if try hallucinogens or other drugs I hope that it does work well for you and you can get a kickstart on your path. But I’d really suggest putting pen to paper first, even if you try entheogens, and identify the points you truly need to work on.
Just my 2 cents. Good luck brother!