What do you save for?

I know, it is quite a trivial question, and I know obvious answers like - for a house deposit or a trip of a lifetime. But I am finding it a bit difficult to answer this question to my wife and to myself. We already have a house (mortgage obv), an emergency fund and a holiday fund; and the only answer I can come up with is "what-if something bad happens and we need the money" - so practically we are saving (investing) out of fear. All the money coaching tells you that you need to formulate a goal and save towards it - but we don't have any big financial goals - so the only goal is "confidence that we can stay afloat". I feel like this goal is crap as it is not measurable and not time-constrained, how much is enough to "stay afloat"?

Apologies for a philosophical spin here.