I already posted to anotherserver/c/books and no one ever saw it.
Did you promote that community on !newcommunities and other promotion communities? Did you actively post on your new community, to attract users to your new one?
I’m going to take two examples I personally had
I’m not a fan of having all discussions on LW, so even if !movies was the most active one, we decided with a few others to start animating !moviesandtv. It is now the most active community on that topic.
I like the show “the Office”. !dundermifflin is the historical community, but as some people are not fans of lemmy.ml, we moved to !dundermifflin, which is now the most active community on this topic.
I guess that shows that community takeover is possible, and does not need additional tools, just some time and dedication.