Big 
. “Head” stuff on its own often won’t be sufficient to really “get it”. You need the “heart” stuff. See From polycrisis to metacrisis and a second renaissance (SCQH) for more on this.
I would also likely expand the list of things that can do that beyond contemplation and plant medicines – there may be other dharma doors.
This question of what supports people to see this is a very active area of enquiry for me and others at Life Itself.
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