I honestly cannot guarantee much engagement here because I'm way more heavily focused on visual novels that fall in the !otomegames@ani.social genre, but I do try to actively comment on anything I can offer anything on. Best wishes and thanks for taking this on!
I think keeping an eye on the Fedigrow community might be helpful. I was advised to do more image posts which do tend to get more engagement overall, and that writing the first comment on a post helps make people feel more comfortable commenting themselves. Not sure how useful that advice is but it is what I have been told.
Also, dumb memes that can sometimes apply to other genres too tend to get me more upvotes, and also sometimes-off-topic-this-is-an-otome-community-not-any-game-ever engagement from people scrolling on Local or All