I maintain a bunch of anime communities including this one. I used to post to these every day in rotation. In these 9 months I was basically the only one that kept them active save for like 2 other people that posted more than once. I got burned out a bit and stopped posting. In this time, no one else posted and no one seemed to care that all activity fell off a cliff.
but I don’t want to keep this active by myself
To stop this negative feedback loop, I tried to be the one who does the initial work and hoped for people taking up along side. However, as you can see this did not work out very well. There are always way more lurkers than posters. Unfortunately I don't think Lemmy has a userbase big enough for smaller communities like this to work out very well.
I do moderate these communities even when I don't post (which just amounts to checking daily if nothing horrendous is posed). Lately I have started posting again and a azumanga post is in the schedule, but I don't think I will return to my old output quantity.
To really answer the question "Is this place active anymore?" depending on your definition of active it might never have been active.