I can't see how pricing is a problem for startups. I mean, you are paying somebody several thousand per month can't you afford $50 a month a seat to make them productive?
On top of that the low price comes right out of your pocket and makes you automatically less profitable.
I'd rather make a high priced product that can convince people to pay the price. There are very similar products used in areas other than software that are called "case management" it is a market I'd researched looking for applications of semantic technology. You might want to pivot to one of those markets. With software devs you are up against
https://blog.codinghorror.com/we-dont-use-software-that-cost...
An alternate idea is to make this the "anti-agile" project management tool to target the many people who think they hate agile... Maybe it is really agile but it tries to persuade people who hate agile that it really isn't.
Alternatively, start with an open source bug tracker. But offer to host it, and create improvements for it. It's been a long time, but you can set up something like bugzilla. (There's probably a more modern alternative out there).
Here's another idea. Start ups don't have a lot of money, consider receiving equity from the start up every month. Instead of a monthly rate, you receive shares every month. You will probably need a lawyer to set up this contract and there is probably a problem with this idea. I don't think you can receive ISOs, unless you are an employee, so they might have to hire you too, while they are using your bug tracking service.
I'd look for non-obvious differentiators. Most of your competitors are cloud based. Would some customers want an on-prem solution for specific reasons (regulatory, data privacy, data sovereignty)? What about people who aren't sitting in front of computers all day? How are they managing projects? What about users with crappy net connections?
> The main thing is, I never want to give up, and I won't give up.
Just focus on this. When things at the most bleak, remember that you're not allowed to quit, so work around that.
Focus on the niche market first and expand from there.
Just "it's cheaper" isn't much of a place to start from.
Fill a niche in the market, provide excellent value.