I already posted to anotherserver/c/books and no one ever saw it.

Did you promote that community on !newcommunities@lemmy.world 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@lemmy.world was the most active one, we decided with a few others to start animating !moviesandtv@lemm.ee. It is now the most active community on that topic.
• I like the show “the Office”. !dundermifflin@lemmy.ml is the historical community, but as some people are not fans of lemmy.ml, we moved to !dundermifflin@lemm.ee, 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.