If there's no health reason not to, try a different food. A fish based one maybe. Give a little bit at first to avoid upsets. If you keep two types in stock you

If there's no health reason not to, try a different food. A fish based one maybe. Give a little bit at first to avoid upsets. If you keep two types in stock you can switch frequently rather than just feeding the same one and switching when the bag is empty. They probably don't have the abstract concept of purpose, but they have various drives, like we do, some of which may be unsatisfied. May be worth reading a few books. Catwatching by Desmond Morris is good, but quite old now. However I think even the wild cousins sleep 16 hours.