I'll add something I wish I had realized several years ago: build a SaaS is not the only path to a product business, and for a solo founder, it's (in my opinion) probably not a very good path. I spent 5 years trying to get a micro ISV off the ground which made scheduling software for hair salons. It was a terrible idea for a large number of reasons (described in detail here: https://www.jasonswett.net/im-shutting-dow…
Amy Hoy says the best way for solo founders to start off is with in info product. Just to cut their teeth at marketing and such.
One thing, now that you have got that ball rolling I think you might consider another saas product in the future because you have so much learning about that.
The one good thing about a saas product with good market fit is that you will get years of recurring revenue from the same customers.
With pluggio I had some customers hitting $3.5k over time (and higher).
That is the real power of saas and why it's worth considering in the long run.
Edit: I guess it may be useful to note we have a bunch of articles here - https://blog.nugget.one/ - about how to avoid the kind of issues you spoke about in your blog.