My story is very similar to yours. B2B SaaS, bootstrapped (still no capital raised after 7 years), even the price is the same. We had 4 co-founders, I wrote the code. Here's a brain dump of things we learned:
When we started we were all fresh out of (or still finishing) university and had fairly small savings. Definitely not a year of runway. So we found jobs that were relatively easy, well paying, and minimally distracting. Our goal was to earn only enough to live off, so while we kept the jobs we had infinite runway.
In my case I reached out to one of my uni lecturers and convinced him to add me to the tutoring team for one of his first year programming subjects. It was super easy content, the pay was pretty good, and I didn't have to think about it at all when I wasn't working on it. The other guys took other odd jobs around the university, for similar reasons. I am less a fan of the consulting strategy - it feels too easy for that to take over your focus.
Our internal goal was 100K ARR within our first year. If we did that, we'd all quit our other jobs and go full time on this, and start paying ourselves. We got pretty close to that target but went all in anyway.
If you can hit 100K ARR and keep your costs of living low, you won't need to raise a seed round. I don't know anything about you - we had just finished uni so we were in a good position to live cheap. We would make 100 meals for $100 and eat a lot of chilli con carne + rice: https://i.imgur.com/9BtnOkP.png
It was 6 months from first code written, to first customer paying us. And then about 9 months from there to 100K ARR. Our typical customer at the time was worth about $200/month ($2.4k ARR). Don't lose hope, you might be just on the cusp of some cash. The advice about charging more in this thread is bad advice without knowing how many users each business you sell to will have. In our case it was at least 20 (we sell a whole of business product, so it was defined by company size), which was totally sufficient.
We didn't hire anyone until we'd been going for about 18 months. Because we couldn't afford it. But in hindsight it helped. If you hire 4-6 devs now you're going to spend all your time managing them instead of learning what product you are building. Learning to be a manager takes a long time and you'll probably be bad at it at first - particularly if you'd rather be coding. Anecdotally I think we had a year lag from when we first hired a few extra devs, to when we got a significant increase in product output.
Don't do pilots. If you are building a feature for someone, make them sign a contract to actually buy the product contingent on that feature. Pilots give people an easy option to not buy after you've done a lot of free work.
Don't raise money from people other than customers if you don't have to.
My email is in my profile, reach out if you want to chat.