The Technical Steering Committee (TSC) is responsible for the oversight of the AsyncAPI Initiative. Maintainers (aka committers) make decisions at the given repository/project level. The TSC helps to make decisions on a higher level, or when maintainers cannot find a consensus.
Anybody can become a member of the TSC. All you have to do is become a maintainer of one of the AsyncAPI projects! To become a maintainer, you just need to regularly contribute to one of the projects and then other maintainers will invite you to join. You can also build a great AsyncAPI-based project that we don't have yet in our GitHub organization and donate it (we'll ask you to stay as a maintainer).