I think that navigating related content is a key part of the Wikipedia experience [1][2] and surfacing related articles is really great. I'll check this to see how each method works on different articles.
I was also thinking a bit about how we could present this to users, and there may be options where we can use more than one criteria and make articles more prominent. Just an idea to add to the exploration:
We can show three article "cards" to the user after reaching the end of the article (as if they were thrown randomly). The cards include article title, image, and the criteria (e.g., nearby). Depending on the article different criteria can be used (e.g., depending on whether the linked articles are stubs, the distance of the nearby articles...). Optionally, cards can be discarded for new random cards to appear (maybe keeping the criteria for the next card).
Pau