Mental prison is when you create a scenario in your head which prevents you from accomplishing your goals. For example, you might want to finish the Qur’an but you convince yourself it’s impossible for you to memorize this whole book after several failed tries and you lock yourself in mental prison which only you can unlock.
One of the ways we can break that prison is first realizing the importance of our life goals. Each one of us has limited time on this world and there is no time for us to wait whatever you think will free you from your own prison. Knowing the significance of your goal will motivate you to slowly weaken the walls and the bars of your prison.
Having support people is also another essential part of freeing yourself.
Wa bilahi Tawfiq.