I don't pay super close attention to the numbers, but I glance at the daily users and subs now and then in the comm where I'm pretty much the only poster. I feel I'm down about 25% in daily users and new subs have felt slower.
I've tried posting a second or third post a day to try to catch anyone in a drastically different time zone, but the second post gets less likes than the first. Comments feel down, and more importantly, I don't see near as much growth of "regulars" who comment. I got used to seeing a few names every day or 2 in the comments, but many of them I don't hear from anymore. I do have a few new regulars, but most seem to comment less frequently, and if I'm not holding onto them long term, activity is never going to snowball.
It seems consistent with what I see when I browse All, Top 6 Hours. I'm always worried it's something I'm doing wrong, but I seem to trend pretty consistent with what I see of Lemmy as a whole. I do block essentially all meme communities, so I don't know how their popularity is holding up. I keep Science Memes unblocked for now, because some are actually funny or educational, but somedays they hog up too much of the top posts.
I try to keep posting more in depth and original things, but it demotivates me as a poster to keep working hard and putting in hours when the audience seems like it's shrinking. I try to post more than just cute pics, I try to share news, research, and facts, and I'll do reports on research papers or books so everyone else doesn't have to dig through all the dry stuff. That stuff takes up a good bit of time. I'm trying to keep a popular niche comm alive, and I think it's fun as it's typically positive stories and non-political 99% of the time, so it's what eeeeeeveryone says they want here, but how long are posters supposed to post to what looks like an empty room?
I still try to comment back to anyone who leaves a comment, so they know I'm seeing it and that I really appreciate it. But I can only do so much. I'm really holding out, but I start to wonder what Lemmy will be like at the end of this year.