Yes I know the feeling but I think you should just try to be more patient. If you are unable to find things in the span of decades then that is unfortunate, you could say that you are doing something wrong but there are definitely rare ones and you need to find an opening into circles that can either find new things or forward you. That's as much as I wanna talk about it, other things might be considered source discussion.
Anyway I never really had this problem for a really long while, in the course of 5-6 years I have pretty much found everything I was looking for and more. And ironically beyond a certain point I became preoccupied with other things and now don't really have the opportunity to sample novel things anymore. But perhaps in the future. They will definitely wait for me in the freezer.
Also, I am glad I didn't find drugs more quickly or easily than I have because it has forced me to start modest and gradually broaden my horizon. One of the first things I think when someone asks if certain really potent psychedelics like DMT are suitable for a first time tripping is: it would ruin the development. Compare it to a game like RTS if you will, if you use cheat codes and bypass the tech tree to have everything available it's extra fun for a really short while and then becomes old quickly and it can be harder to appreciate the weaker and odd things the same way. It's not what I would call a gradually integrated path because you create a much 'tighter' frame of reference that way. Sure at that point you can fine tune but I would not expect your sensitivity to be the same.