Memory is decreasing day by day. Why is this happening and how to improve memory? If sin, obscenity works in the mind, the memory decreases.

 

Remembrance is one of the best blessings for a servant from Allah Almighty. When a servant indulges in sin or indecency, the Creator Himself slowly withdraws that blessing from the servant. He took the blessing.

In this regard, there is a reference to an incident of Imam Shafi'i's own real life experience. You can find it by doing a google search.