Firstly, building a business (especially in a crowded space) is stressful. It's not a place to recover from burnout. It's not a place that reduces anxiety. So my first recommendation is to relax a bit, put this on the back burner, and when you're ready go look for your next job.
Secondly, treat this project as an education. You had an idea and spent months implementing it. That's the easy part. The hard part is finding a market willing to pay money for something.
So for your next project do the hard part first. First find a market, find out what they will spend, ideally collect a small deposit (to prove they're serious) and then go from there.
In my business we have 3 main product lines. The first 2 happened because the market paid us to build a solution. We iterated on those for 30 years, and we now are big players (in very niche spaces.)
The 3rd happened as a take-over of a project by another retiring developer. He had a few customers, and a good product, but in a crowded space where there's lots of reasons not to change. It's taken many years to build it out, despite being clearly better than the competition, and it's still barely profitable (if you ignore a bunch of expenses paid by the whole business. )
The lesson being to follow the money, not the idea. (Aside, early on we followed some ideas, all those projects died, most without generating any revenue.)
So congratulations to seeing something through to release. But turning a product into a business is really hard. Turning a commodity like this into a business is almost impossible.
I wish you well in your future endeavors.