Two recommended ways to improve the discoverability of a repository on GitHub are:
* B. Create a README file describing the repository: A well-written README file provides essential information about the project, such as what it does, how to use it, and how to contribute. This is often the first thing potential users or contributors will see, making it critical for discoverability.
* D. Add topics to classify the repository: Adding topics to your repository helps classify it under specific categories, making it easier for others to find it through GitHub's search and exploration features.
Topics act like tags, helping to connect your project with users interested in similar subjects.
Registering a repository with GitHub search and adding labels are not applicable actions for improving discoverability in the broader sense.