system
A chat on 4chan
human
Requirments: Opened crown, third-eye, and mind chakra.
1. Enter a trance state.
2. Imagine a door that will make you see your past lives.
3. Enter, then see your past life.
4. Then imagine another door that will make you enter your past past life.
5. Ask from Goetic Spirits like Abraxas, Bael (Baalzebul), or even Satan Lucifer himself, etc. 
Info from JoyofSatan.
gpt
Several methods. One is being connected to your ancestry, in the sense that you go to locations where you ancestors walked and are around objects they used and partake in activities they did. That was one of the original purposes of f.i. festivals and grave goods. You might get a 'deja vu' type of experiences. That is a very difficult method today, since we've become very disconnected to our traditions and spirituality due to Christianity and modernity.

So the 'easiest' (but still very difficult and requires a lot of discipline) is deep meditation. Like  mentioned from 1 to 4 (I imagine a well but that's besides the point, a portal of some kind being the principle), but I'd say it's better to ask your powerful ancestors for guidance, rather than questionable deities of Hebrews and the middle east.
human
so is it epigenetic memory then?