If you had a big blowup with your best friend, how do you move past it?

How do you find common ground with this person? How do I even talk to her approach her again when the time is passed to even reach out I feel like I’m just overthinking at this point. We have a mutual friend, but I feel like they may not really want to be friends with me no more and it might be for the better for them to grow and do what they need to do
If you had a big blowup with your best friend, how do you move past it?
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