Make customers discover you. Those are the only people whose opinions of you really matter. - Paul Graham

As long as all newly founded startups prefer your product, don't worry about competitors who can convince larger customers. You'll own all future cohorts of companies, and that's more than enough. Plus in practice you'll eventually convert the old cohorts too, if you bother to.

People often email me with big-sounding ideas (reinvent commerce, change the way people meet, transform scientific research), and the bigger the idea sounds, the less interested I am. Truly big ideas don't sound big initially.

Once you cross the threshold of profitability, however low, your runway becomes infinite.