The products almost everywhere have increased in price. Try groceries!
The simple facts are:
Cruising has changed since Covid. The good old days are exactly that and are gone.
Second, Celebrity and the rest are selling out. Supply and demand sets the price. Similar experiences at other lines are priced at equally high levels.
DW and I have reduced our cruising and now book cruises looking at the itinerary, not just at Celebrity. Other lines all had things we found to be great and others where Celebrity still in our opinion do it better.
The food, FWIW, has declined on Princess, Holland and Norwegian; but Celebrity probably a bit better in comparison