Yes, there is a secret, and it is very simple:

"Whosoever wants to awaken the consciousness in the Superior Worlds must begin by awakening it in the here and now." - Samael Aun Weor

"Many disciples exist who, in spite of having known our clues for astral projection, have not learned how to project themselves at will. The failure of these students is due to the fact that they already lost the powers of their Astral Body; these students have no other choice but to be submit themselves to the discipline of meditation: this is how they will recover their lost powers." - Samael Aun Weor

Focus on improving your self-observation, self-remembering, and meditation.