Expiation for hurting others

Asalamu Alaikum! I hurt many people in my life and I regret it a lot. I feel very sad about it and I’m trying to be different now but I feel like there is this huge burden on me. Will Allah ever forgive me if I make du’a for them always? And if I make dua and do good deeds on their behalf will they be accepted and compensated for what I did? Will I be punished for this or no? I don’t know some of them and some don’t know about it, and some I cannot contact so that is why. Is this okay? Jazakallah Khair. 😊💕