Hello, Danbooru community!
I suggest adding a simple but useful feature: a system of likes for other people's "Favorite Groups" and sorting by the number of likes.
How it could work:
Each user can like (or "star") another user's group.
In the group view section, add a sorting option: "By popularity (likes)", etc. This will help you quickly find top collections, for example, the best art by the "vocaloid" tag or themed sets.
Show the likes counter next to the name of the groups in the list (such as "♥150").
For users it's easier to discover content. Imagine: the top 10 groups by likes for a week are like "hot" recommendations, but based on the opinion of the community.