If you could teach one lesson or insight to yourself 10 years ago, what would it be?

In my case, I would say “It’s okay to regret, and it’s okay to mourn the potential of the life you don’t get to live, just don’t let it stop you from being happy as if that life was the only way.”
If you could teach one lesson or insight to yourself 10 years ago, what would it be?
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