I was introduced to astral travel by my friends Ketamine and Delerium Tremens.
Since then we haven't spoken much, but I can still find my way to that little door they opened for me. ð
In the words of Hadit: "Worship me with wine and strange drugs."
A little (consecrated) valerian root an hour before meditation might help nudge you out that door--but most people are shite-scared to leave their physical body behind. Fear is the main reason most can't acheive astral travel. That and lack of effort.