Ask HN: how to be constantly motivated as a developer?

I've been a software developer for almost 10 years now, and have worked for known big companies, as well as few years at startups. After a while at any company, I noticed that I grow frustrated and just recently I understood the actual reason for that: I need to be constantly learning. I like to learn new languages, new tools, put in place new processes, improve the development, improve the code, and investigate root cause of challenging production issues. It doesn't have to be about technology necessarily, but I need to be making progress, learning more about the world in general, in a way that I can apply this knowledge.

I've seen that, due to business needs or other reasons, I end up doing the same things for a long time and, although there are always chances of learning, they tend not to be very frequent or as much as I would need. In spite of that, I've always been a high performer even when demotivated. I do push myself at home to keep growing, but I need to be really motivated to go to work as well, as I know I can do better.

It seems that, if I can find a way of leveraging these skills and will to keep learning and improving myself, I would impact teams and companies much more than what I've been doing. I thought of joining startups or starting my own, but don't know if that solves the problem. And currently I am demotivated at a new job after only a few months, what makes me worried as this cannot go on like that forever.

Does any have any piece of advice? Has anyone gone through something similar? Any company or position that you'd suggest I take a look at? Is there any company that really values this kind of professional?

Thanks.