Have you messed up?  Is there something in your life that you believe cannot be forgiven?  Repent and know that with heartfelt (it is always a heart issue) repentance God forgets that transgression.

If you have repented, do not stay locked in a sin that He has forgiven and forgotten.   Do not continually ruminate over something that is over and finished.

Do not let something you have done in the past become a stronghold that keeps you from moving forward in your life unencumbered.  Focusing on the past can block present blessings because your focus is diverted from what God