Here‘s my hack: Surround yourself with equally capable finishers. Once I figured out that there were lots of people out there who had great finishing, endurance and project management skills, but lacking the knowledge and the creativity in how to build them, I just started to put both of them together.
Granted, it often doesn‘t feel good being pushed into finishing your own things, but the joy of having delivered something tangible makes up for it. And as a bonus, even in something as big as building a company, I got to start hundreds of sub-projects and seeing most of them grow to fruitition!