Oh, of course, nothing about LSD can give me access to things that my brain just doesn't have access to. It can help with the things that already are in my brain though.

Your brain does have access to all rational truth

My brain has the ability to claim anything it wants as truth. I prefer for my truth to either be consistent with an objective or empirical truth, or be measurably opposed to truths I disagree with (and to a known degree). I don't always achieve this and I'm not always the best at being open-minded but it is the goal, I would think.

Empirical truth is a lesser form of truth, look for necessary truth, purely rational

Wha? Empirical truth is a lesser form of truth? What are you getting at there?

Empirical observation is contingent, so cannot be the basis of certain knowledge.

Everything is contingent on empirical observation. Our rational brains are the product of pattern matching algorithms trained on empirical reality. There is no basis for rational thought that is not downstream of empiricism.