Great advice but that may not always work in Ireland. The expected answer is “grand” or something similarly neutral and succinct. The asker may not even stop to listen to your answer so you won’t have enough time to provide a decent response.

Your suggestion would work when both people are in the same place for some time, e.g., waiting in line for a coffee, or for a meeting to start or for a lift (elevator) to arrive, etc.

I sometimes go to concerts by myself and like to arrive early to catch the support act. There’s usually a gap of at least half an hour before the main act comes on stage and I make a point of looking around for other people who aren’t on their phone so I can start a conversation. In that situation, I already know we have something in common.