How can one return to righteousness and religious commitment after a period of spiritual relapse, depression, addiction to forbidden things, and the fear of dying in this state?

A person's realization of their shortcomings is a sign of good. It is advisable to seek out the reasons that led to the change in condition, for it might be a sin that opened doors to evil, or an overexertion of the self that led to weariness. These reasons must be rectified, followed by sincere repentance, and then focusing on oneself to perfect its virtues. If needed, trustworthy psychiatrists can be consulted.