Even with the discontinuation of the project the current latest version of RVX is expected to work for a long time, preparations were also taken to hopefully give the last release an even longer lifespan.

If you want to switch to something else, the first obvious choice is the original ReVanced project.

For something completely independent from Google’s YouTube application and its limitations, you should try Futo’s Grayjay, it also supports logging in with your Google account for subscriptions, recommendations and watch history as usual.