The principles behind piercing the veil of forgetting are easy.

[Adonai One]

Easy mode: Put yourself in a deeply relaxed state and clear your mind to the point of trance with the intention of seeing a past life. It will come to you.

Hard mode: Want to remember all of your lives like you never died? Clear as crystal? Astral project and go to the inner planes. Find the "hall of records" with the intent of seeing all of your past lives. It will all come back to you. However, your life on Earth will never be the same.

Humanity has all of the sparks to get true universal context. It just doesn't use them for whatever reason.