Stay in a quiet room
Start with Auzobillahiminah Shaitanirrajeem
Bismillah Arahman Arrahim.
Make 3 salawat upon prophet
Make 11 Astagfirullah
Then contemplate on hereafter
Have your prayer beads with you and recite 99 times La Allah il Allah loudly with your tongue, mind and soul.
Recite 99 times Allahu loudly
Recite 99 times Ya Hayy
Then think about past and appreciate with your good deeds. Feel sorry for the wrongs.
At end Say Alhamdolillah, make salawat upon the Prophet
Then a short dua.
Whatever comes from your heart. It will take 15 minutes.
Do this for a week.