I know a friend who did something similar in a 'crowded' SaaS market. He thought it will take him 6 months to make a hundred grands an year - it took him 3 years, but he kept at it.

Now it makes a few hundred grands an year to pay for his nomad vacation lifestyle and he has hired help to grow.

I think growing an existing SaaS is one of the safest business to build online. The market is already proven and you will find a niche over time even if it is not pricing. The most important thing - dont die.