Find laser focused target audience for Free

I cold-emailed 40 people and got 2 paid users. What a perfect way to find a laser-focused target audience for free! Here's how I did it: Go to Google. Type: site:linkedin.com "content creators" "New York" "@gmail.com". Then, I used the "email extractor" Chrome extension to get emails and pasted them into a custom-coded Google Sheet to send emails to all of them, as I already have a Google Workspace email with which you can easily send up to 1000 emails per day. I used 100% plain text email, no links. I tried and tested many types of email marketing tools, but all of them add tracking codes that trigger a Google spam filter and land them in the updates or promotions folder. But here, I land directly in the primary inbox. Now you may be thinking about how I tracked paid users without any links or UTMs in plain emails. To track where they came from, I added one simple survey asking how they discovered us. They mentioned my email. I added this survey just after payment as part of the user onboarding process. I hope this helps you find your users.