Questions to ask

Do we think we're underperforming?

Are there other examples of similar keywords where there was only 1 page that was doing better? Or was it when the 2nd page was introduced that the 1st collapsed?

Do competing pages both appear?

In case of similar keywords that are less ambiguous in intent, if those 2 keywords had completely different results, one could have 2 separate pages & make sure that they're clearly differentiated. But if same pages appear on all similar keywords, consider having 1 page as well because that seems to be what Google is preferring. It isn't separating out these intents.