This is the energy that is gained when you have started a project and you really feel like your understanding your audience now. It gives you that impetus to continue making more work and allows you to overcome minor obstacles that occur in your path. Depending on how much speed you have acquired, the force that is present will propel you to greater things or it will left you languishing in the doldrums if sufficient friction is encountered.
Momentum can also be considered motivation if you don’t like the physics analogy that I was using. Sometimes looking at things from a different perspective is all that is required to create innovation or to breathe new life into an old idea.
Whatever terminology you like, find your specific angle and pursuit it with all your strength. You will find that you have a lot less resistance from yourself if you work with what you are good at regardless of profitability. The inertia that has previously been holding you back will disappear and the acceleration towards your goal will be phenomenal. The velocity that is unleashed when you know your purpose is unlike anything you will have seen before.
Just know that you may have to conduct many experiments before finding out the correct materials to use but once you have it figured out, the mathematics of it all will seem like child’s play. You will perhaps also wonder how you could have gone on for so long without knowing what appears to be so obvious now.