Be clear and positive about how far you've come, and relentless about continuing to move in a good and fulfilling direction.
The search for meaning bears fruit when you stop merely searching and start actually doing.
Get yourself clearly and acutely focused on the best possibilities, and fulfill them in the way you live your life.
Rapidly demonstrate to yourself what you're capable of doing. That will naturally encourage you to do even more.
What you expect is, to a large degree, what you get. It's not magic, but based on awareness, feedback, and motivation.
Regret happens, yet it never has to be the end of your story. You have much better things to do now.