If you want greater mobility in the astral dimension, identify, through self-observation, and comprehend, through meditation, all of those egos in your psyche that make you dense and heavy like lead, such as negative emotions, anger, frustration, envy, etc.
This experience can show you the need to work on your emotions, since if we save emotional energy, we have greater mobility and energy to travel throughout the internal dimensions.
For thirty years I sought God. But when I looked carefully I found that in reality God was the seeker and I the sought. -Bayazid al-Bastami