I don't think lemmy is still growing. I might be wrong but this graph https://fedidb.org/current-events/threadiverse
is trending down and i've seen a lot of smaller magazines/communities that haven't had any posts for 1-2weeks by now.
I try to help that problem at little but i doubt lemmy&kbin has >100k active users right now.
I think it is currently growing, as in more people will visit tomorrow than did today, but also it has shrank since a couple weeks ago when everyone was hyping it up as a reddit alternative and trying it out. Not everyone who came to try it has stayed.
A lot of people just want the endless scroll. No need to comment or post, just consume the posts. They would go back to Reddit for now because Lemmy is not a decade old content machine.