The best place to start is a substituted phenethylamine rather than a tryptamine, as these compounds tend to be gentler, more euphoric and less reality-shattering. Some research chemicals that are good options:
https://psychonautwiki.org/wiki/2C-C https://psychonautwiki.org/wiki/2C-E
In terms of consciousness expanding, DMT (in the form of Ayahuasca) is probably the most potent psychedelic. It can be emotionally intense though, so not the place to start.