Write about it. Add a blog to your function once you have identified your target audience. Make sure you can create links from the posts. Once you have the short articles, post the link with commentary to where the right audience is. This is often in places like Reddit. Reddit has a lot of topical forums.

You want to sit down and write something called an ICP, Ideal Customer Profile who you imagine would be the ideal customer for your product. This is the primary target.

Then you want to do another thing. Figure out how what you created is being used. It might not be anything which you planned. Once you figure out how your thing is being used figure out where the people who are using it are. Then go there.