My go-to is to ask what they like to do in their spare time.
A lot of the time you’ll get answers about how they have none or how it’s filled with chores, but you can always redirect and say, if you suddenly had a bunch of free time just for yourself, and you couldn’t use it to work, what would you fill it with?
In my mind the latter gets you down to what brings them joy, and in some cases how they want to see themselves, which can tell you a lot about a person.