The best way is to learn from the mistake. Take a rest from the thing that made you fall. Like what I did in the past. When I did not do well in my investment, I just took a time off till one day I would be ready again. It takes a lot of time.

Sometimes after you fall, you need to divert yourself to another area which you like, so i guess its always good to have loads of different interest.

Seek help.
Know someone who is good in that certain topic and ask for help. We can't always see our own mistakes.