For me it would be enough if RSS feeds could include <recommended-feed href="https://someone-elses/rss.xml" reason="Friend's travel blog" /> and RSS reader allowed to browse through the web of recomendations and add allowed to add selected ones to my feedreader list.

A potentially standard way to find other related feeds, instead of just consuming the content of one author/website. Curated by real humans that produce useful content (that's why I have them subscribed).

Simple thing that could have been very powerful for discovery if this was thought about early enough.