After 4 years, I have to imagine your startup has matured to the point where you are no longer feeling like you can make a significant impact. It's diminishing

After 4 years, I have to imagine your startup has matured to the point where you are no longer feeling like you can make a significant impact. It's diminishing returns for your cognitive output from here on out unless the company has a reason to invest in a large R&D project and you get to work on it. You can either come to terms with working on problems that motivate you sufficiently or you can hit the road and find your happiness elsewhere.