You can use this Nekton flow to find new users for your project. Just provide a list of relevant keywords and websites to search on.
This automation will find the pages created on the last day that mention your keywords, and send you a summary over email. Then you can go and chat with those users to advertise your product.
For example, you can configure this flow to search for "need automation" on reddit.com and indiehackers.com.
You can also use this flow to get notified about mentions of your or competitor's product, or any other topics you want to monitor.