So what I do is hope that those two blogrolls have been updated. Is there a standard "/blogroll" page so I can easily automate looking for blogrolls in the blogs I follow? Or maybe a site listing some? https://indieweb.org/blogroll seems a bit outdated.
I might investigate all the blogs I list on my blogroll and see if they have one and link to it next to the RSS link (if you are there, you'll probably want to see more).
Also mine is an example of hard-to-find blogroll, I should fix that
Anyway, this was all due to this post https://rusingh.com/articles/2020/06/04/keeping-myself-motivated-to-write/ where I found a new blogroll which was also due to "right time right place", since it doesn't look very discoverable otherwise. Now I have 3 blogrolls to check out when looking for new blogs :)
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