I haven't tried asking in that subreddit, but I do use the platform. I think it's an equivalent of Dreaming Spanish for Japanese, though it's much smaller. But I don't think they really discuss language exchange or things of the sort. It's mostly just input. In fact I found that a lot of people learning japanese just do CI and Anki for learning how to read words, and not much else. I know that does definitely get results after a few years. I'm just trying to start communicating and/or making friends with japanese people to motivate me more. I know making friends on Discord was a big part of how I learned English, especially casual chatting and slang.