What is the ruling on one who committed crimes with takfir (declaring someone a disbeliever) groups and then repented? How does he clear his conscience?

Question:
The questioner says: I am a young man from an Islamic country who was deceived, so I joined a takfir (declaring someone a disbeliever) group that was hidden under the guise of supporting the truth and removing oppression from society. I carried weapons with them and committed several criminal acts with them, including killing and lesser offenses. Then Allah bestowed upon me the favor of knowing the truth and recognizing the status and position of the scholars. So I left the brutality and takfir (declaring someone a disbeliever) I was engaged in and repented to Allah the Exalted. I have some questions for which I seek your answer. The first question is: How do I clear my conscience of what I did?

Answer:
Praise be to Allah who granted you the favor of repentance and knowing the truth; this is a great blessing. As for the injustices, you must return those you are able to return. For those you are not able to return, repentance is sufficient. If you took money unjustly and oppressively and are unable to return it to its owner, you must dispose of it by giving it in charity, and its reward will belong to its owner. Yes.