Assalam o Alaikum Sheikh ! Alhamdulilah I have left major sins by the grace of allah but there is one sin that I couldnt leave it , I have tried a lot and that is private sin , like watching haram stuff on mobile what to do sheikh I am very worried about it , Jazak Allah Khair

Repentance is accepted however many times it is broken, so long as it is sincere, and Imam Ibn Baz said that if you were truthful in the first repentance and the second and the third, what came before does not harm you, and only the last fall harms you until you repent from it. Cut off the doors that lead you back to it, keep away from bad company and hold to the company of the righteous.