Ask HN: How to market and sale SaaS product?

The classic problem: we have a product, 4-5 people validated it and two bought it. But, how do I market my SaaS product?

Without spending thousands of dollars on user acquisition, are there any ways new founders with little network can employ?

I have tried posting to Reddit, but mods removed post aggressively. I haven’t tried PH and HN.

Any other suggestions for solo founders?