Recommend a book about staying focused

I've been selling software for 5 years now and have had some good success with it. I just have a problem staying focused. It's blocking me from taking my 6 figure a year projects to 7 figure a year projects. I switch between being a visionary who employs programmers, and being a visionary and doing all the coding myself, based on the project. I need a book that helps me stay concentrated when things get boring. A dozen ideas a week, how to focus on the one.

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