It is possible that the biggest enemy Cake has is simply time. If we just keep hanging in there and putting out more content, maybe at some point the scale will tip in the type of direction that we all want.
I agree that time is a major factor, but from a different perspective. Reading is seen as a time consumer nowadays. Many people don't want to spend time reading when they can watch a video or listen to a podcast. Same might go for creating content. I know I take several days to write some of my lengthier posts, and maybe others just don't have the time (or don't want to commit the time) to do the same? Sure they could write short posts, nothing wrong with that, but then what's the difference between Cake and Twitter if Cake is flooded with short posts that contain little to no substance?
I think Cake definitely isn't for everyone, so the challenge isn't just finding people, but finding the right people who might enjoy the platform. There's definitely a lot of passionate people on the internet who would love to debate and discuss their favourite topics with others, we just need to "lure" them here. Topics like movies and TV series, video games, smartphones, sports, these seem to have the most vocal followers (that I've seen), so having content that revolves around these topics might help for a start. From my own experience, these topics seem to be lacking on Cake. I try my best to contribute to these topics but we need more.
Even if @slamdunk406 and I take over the Cake Twitter account, we still need content to share to get the ball rolling.