If it is just missing skill: Find the best way for you to practice and practice. Just retrying will get you somewhere.

If it is not a missing professional skill, but a psychological reason, which blocks you, is different. I would say, you first need to realize the exact thing, which hinders you. After you identified that, find a way to circumvent it. This is more difficult, but everyone faces it, so there are many resources about. I personally think acknowledging that your brain is just a human machine, which acts in some situations in some way and can get triggered into different states is key. Most of the time it is not about willpower.