Something exciting was just announced: Audacium is merging with Tenacity!
@gperson (who's writing this post), the new maintainer of Tenacity, contacted the maintainer through Matrix, making a proposal to merge Audacium with Tenacity. They accepted the proposal and both talked about ideas for Tenacity, including backporting some Audacity 3.2 features like realtime effects and a new Qt GUI. Then, an announcement was made about the merge.