Having tried all three, its a stark difference in how much more social Lemmy is comparatively. Its not even close. Almost all posts I've encountered on lemmy have interaction; whereas, more often than not, posts on the other two platforms have no interaction. Wonder what the driving factor is behind this difference?
mastodon is awesome if you actually can bring yourself to want to interact with a real person.
If you can't get anything out of mastodon you cannot get anything out of interacting with another human being.
Find someone to care about. Force yourself to care about them.
I prefer my interactions with other human beings to be deeper and more meaningful than what the format offers.