How do you get your first 12 beta testers when you have no audience?

Genuine question, but also sharing what I'm doing right now with a real app.

I built Billd — an Android income tracker for freelancers. You set your hourly rate, log hours daily, see earned vs missed income. No backend, no accounts. Built it in Flutter with zero prior Flutter experience.

It's in Google Play closed testing. The rule: I need 12 testers who stay active for 14 days before Google unlocks production publishing. I have 1 right now.

Here's what I've tried so far:

• Posted my build story on IH main feed (1 comment, 0 form submissions yet)
• Joined 6 IH groups and cross-posting (this post)
• Google Form for Gmail collection: https://forms.gle/5KeUW3XF5HYeHxq7A
• Reddit is a dead end for me — low karma account, posts get shadow-removed

What actually worked for you to get those first 10-15 beta testers? Especially with no existing audience.

If you're a freelancer on Android, I'd genuinely love you as a tester — fills out in 20 seconds.