How do you go from a beta version of your app to actual beta testing?

I'm a dev working on a side project, but for the first time I have a project that has a very well-defined audience (beauty gurus and makeup enthusiasts). I have a beta version of my app in the app store, but I'm nervous to reach out to people in the community because I feel like I only have one shot and I don't want to blow it during the early stages. Any advice? Thank you!