In such cases, it’s advisable to work on upgrades, if possible. Instead of lowering the price of the top-level rooms, you could upgrade one or more bookings made for the entry-level rooms to the top-level rooms, allowing you to offer the cheaper room category again.
For example, if you've sold out of classic rooms and are only selling suites, you could upgrade the highest-paying classic booking to a suite and re-list the classic room. This strategy might put you in "category overbooking" (selling more classic rooms than available), but guests receiving the upgrade are likely to be happy and may leave a positive review.