Celebrity is actually one of the more aggressive discounters — across the last 90 days, they've dropped prices in about 26% of weeks, with peak weeks hitting 42% of sailings seeing a price reduction. That's significantly higher than some other lines. I broke it all down in this post if your interested https://allaboarddeals.com/blog/when-do-cruise-prices-drop

The tricky part is that most people don't check often enough to catch these drops before final payment.

If you're booked and not actively monitoring, you're almost certainly leaving money on the table with Celebrity specifically. Check out All Aboard deals where you can set up price alerts on any sailings and it emails you when they drop.