Are you certain it is the fear of failure? Many times when I work with shadow work and self sabotage clients, it is actually the fear of success that holds people back. But the fear of failure is a socially accepted narrative so we usually go to that one first in our minds to explain our behavior. 

The fear of failure can be overcome by surrendering to failure and accepting it. Oftentimes the brain has a narrative of failing being the end or some unrecoverable moment in time. When you shift the mindset to the entrepreneur mindset and expect failure - you see it as an opportunity to pivot and evolve. There are other mindset hacks as well but this is the key - to change how you see and define these events. 

The fear of success s a bit more challenging because we have to understand the root of the narrative which requires more digging and mining into your past. This is usually centered around fears of outshining people you love, a lack of trust in yourself with success, fake, influence, wealth, or power, and even a deep worthiness issue where you don’t see why you deserve it. As a result what manifests is a sort of weakness in going for your dreams, giving up too soon, being crushed under pressure, procrastination, etc. 

Obviously for your situation we would have to have a consult, but this is generally what I observe for my coaching clients.