A young man did all kinds of haraam actions, and he wants to repent

A young Asks this Question:

I am a young man who is an evildoer (faasiq) and a kaafir (a person who disbelieves in Allah, His Angels, His Messengers, His Books and Day of Judgement). I want to repent to Allaah. I used to do all kinds of haraam (prohibited) actions, and I do not pray. But now I want to repent. I hope the Shaykh can tell me how to repent.

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