Your understanding of things is driven by truth. The less you understand things the more you are drifting away from truth. The closer you move to truth the better your understanding of things become. This applies to everything in your life, physical, mental and spiritual.
Truth indeed does make you free, so begin to make that move towards truth. The opposite of truth is deceit. The more you move towards deceit the less you understand. Deceit has a devastating effect on your belief system by destroying it completely and ensuring that you are enslaved mentally by false things. So this is why you don’t make headway in anything you want to do in your life. You are believing lies.
If you want to get to the top and be successful physically, mentally and spiritually then begin to move towards truth. Begin to read, study and investigate the truth on your terms. Look for truth and begin to be free.