How can I regain the confidence I lost?

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I was passionate about writing a book and publish it on Amazon.

I was passionate about start my own startup.

I was passionate about writing.

I was passionate about creating a successful life.

I have lost confidence in what I’m doing and what I’m passionate about.

When something’s not going the way I want to go, I blame everything around me for that.

How can I regain the confidence I lost? How can I find the root cause?

Please share your answers and thoughts.