well the central site of the web ring could be searched for any particular page that's part of the ring, and that search could be surfaced on any page that's part of the ring.

The full set of pages could be decentralised and cached across all members for robustness, and even include each page's own description and recommendations for every other page if they like.

And then, of course ... rings of webrings with as many levels of aggregation as people are interested in maintaining, again with decentralised caches of pages, their links and descriptions (all human curated of course) that can all be searched whenever a member page or aggregating page opts into it.

Tech capabilities have advanced since the 90s enough now that basic text search in a web page over a small data set is not hard or too much to ask.

And nested rings of rings of rings are scalable because at each level the data will just be links (and descriptions or names if available) while it would be on the user to navigate the various layers however they wish until they find something they're interested in.