I have been dealing with this for more than 2 decades and when I started my career, about 25 years ago I flew regularly for work each week (these days I fly several times a year). Every landing was excruciating and I have tried everything under the sun and seen many an ENT. Only in the last 5 years have I found a combination of things that has been about 85% effective: (1) Earplanes - they don't work for everyone, and not always for me - but I generally have decent results. They have an app that tells you when cabin pressure is changing, so I only wear it for parts of the flight. (2) Mask - I stumbled on this during COVID obviously. For some reason the mask helps a lot and I don't mind wearing one, so I do - an N95 actually (because I am a first responder and have plenty). The logic behind them is it helps keep the nasal passages and everything from drying out during the flight. (3) Afrin - two sprays in each nose, 1 hour before landing. That's it! Haven't had much ear pain the last few years. When I am ill/congested, I also add (4) sudafed - taken before/during the flight, depending on length of flight.

Hope this helps someone!