[pdevr]

(Upvoted for discussion)

I agree that it is very difficult to find the required momentum. Some things which may help, based on my experience:

1. Divide the whole problem into subsets. Identify others who are having the same problem subsets, and partner with them to resolve them. This way, nobody has to divulge their whole business model/idea and yet can collaborate.

At the smallest level, this can be as simple as posting a technical problem on StackOverflow and participating in the discussion that follows. At a higher level, this can be something like identifying a common person to write content for multiple businesses.

2. Keeping intermediate easily reachable goals. This helps to ensure you have momentum, however small it may be. Reaching those goals also peps up your spirits, especially when you are working alone.