There is a list of Discord servers here – 🖥️ Master List of Discord Servers for Japanese Learners
Renshuu has a website (renshuu.org) and Discord. I think it has good contents, but I don’t have good experience with either the website or the app.
LingoDeer isn’t bad as far as I have tried.
I heard someone use Busuu. There might be rarer people that use Bunpo, but Bunpro (with an r) is more popular here (created by a WK user, using SRS style similar to WK).
Where is Tsurukame, or some other clients, or do you use the website, or do you not use WK?
Though, imo, boil down first to the apps you really use.
Personally I learned grammar and phrases first, but I underestimated the amount of vocabularies needed, the lower threshold that crack the JP world experience. (PDF from mitrac also tells what vocab or what to remember first.)
And then, a few years later, WK helped with that. Remember well on the first days, but prioritize the streak of days to remember rather than binge or scraping a lot of everything just on the surface. Try to focus on a few at a time before ever deciding you can’t remember well. (And then I moved on to Anki, where I don’t like default settings which doesn’t stick well until WK style.)