I don't think there is a particular reason why we're here.
We are highly aware learning beings. We figure out why we're here by becoming aware of what we're capable of based off how the world around us works. I feel like this is part of the reason why we go to school.
People will tell you different, but it's based off what happens in the moment. Pictures, videos, etc are different ways you can capture the moment. Going back over memories is a good way to understand why you're here and what that means for the future.
If you want to know why you're here, live your life and find out. As long as you exist, you have no choice but to figure out why for yourself.