What's your go-to way to find customers after launching?

I just built a lead gen tool and I'm realizing the hardest part isn't building, it's finding the first customers. Cold outreach, Product Hunt, Reddit, indie hacker communities. Curious what's actually worked for other makers here.

For context, my tool scrapes business emails from Google Maps in real time. Launching tonight on PH. But right now I'm more interested in hearing how others approached their first 50-100 users.