This was my astral travel technique I found out spontanously in 2016:
Imagine yourself lying counterpart to yourself in bed. It was easy for me to imagine myself lying somewhere else. Keep the imagination until you are out.
In the end of 2017 or the beginning of 2018 three angels sealed my head. I’m now training hard to get out the mentioned way again.
It was easy for me to ‘move’ my consciousness to an other place.
Good Luck with this technique,