Assalamu alaykum Shaykh I used to be able to cry about my sins and feel so relieved and at ease after I made Dua to Allah that He should forgive me. But now I cant cry anymore and I dont feel this Sakeenah and the opening of my heart after asking for forgiveness. What can I do?

Ustadh AbdulAziz al-Haqqan
One of the most effective ways is to cut out some time in your day and make wudu, face the Qibla, turn to Allah, make dua, and pour your heart out to Allah (Subhanahu wa Ta'ala). You will feel the sakina that you mentioned, inshaAllah, coming back.