Founders making real SaaS revenue — how did you actually find your first paying customers? B2C vs B2B

Not theory. Not "build it and they will come." I want to hear from founders who are actually generating revenue — what specifically worked to get your first paying customers?

I'm asking because I've now built two products and tried almost every channel I can think of. Here's what happened with real numbers:

Product 1 — Pregnalyze (pregnalyze.com)
Pregnancy risk calculator backed by 54 peer-reviewed studies covering 500K+ pregnancies. Solid product. Users loved it. We launched with a $5.99 unlock and a $14.99 premium tier.
We ran Google Ads for almost a month:
→ $313 spent on Google Ads
→ 454 clicks at $0.69 avg CPC
→ 4.78% CTR (which is actually good)
→ ~200 email leads who completed the free calculator
→ Paying customers: 1

Let me repeat that. 454 clicks, 200 people engaged enough to leave their email, and only one single person paid $5.99. The product worked — people used it, got value, and left.

We ended up removing the entire payment system and making everything free. Now adding new blogs every week, hoping SEO will work one day, later affiliates.

Product 2 — AdPipe (adpipe.io)
Generates 12 Meta ad copy variants from any product URL across 4 persuasion styles. $39/month.
4 weeks in, 5 days running ads on Facebook, here's what I've tried:
→ Facebook Ads : $73 spent, 89 landing page views, $0.84 avg cost per LPV. People click but don't convert.
→ LinkedIn outreach: Direct DMs to media buyers and e-commerce founders. Great conversations, good feedback, but no sales.
→ Indie Hackers: My previous post here went viral. Got tons of engagement and feedback. Zero paying customers from it.
→ Twitter/LinkedIn posts: Driving some organic traffic. No conversions.
→ Product Hunt: Got featured, then nothing.

One thing I've noticed: Pregnalyze is B2C ($5.99, consumers) and AdPipe is B2B ($39/month, media buyers and e-commerce teams). Two completely different audiences, two different price points, same result — $0. But I suspect the playbook for finding your first paying customer is very different for B2C vs B2B. Is it? Did B2B founders find customers through outreach and relationships while B2C founders relied on ads and content? Or is that assumption wrong?

The products work — people try them, engagement time is 6+ minutes, bounce rate is under 10%. But nobody pulls out their credit card.
So I'm genuinely asking founders who have crossed the $1K, $5K, $10K MRR line:

What channel actually brought your first paying customers? Not what you think should work — what actually did.
How long did it take from launch to first dollar?
How much did you spend before seeing revenue?
Did you have to change your pricing, positioning, or audience before something clicked?
B2C vs B2B — did the model change how you found your first customers?

I don't need motivational advice. I need tactical answers from people who've done it.

If you're also at $0 MRR grinding it out, you're welcome to share your experience too — but I'm specifically hoping to hear from founders who found what works.