Tall people make more money. Use it to buy a better seat.
(I will admit that I peak at "mild" empathy for this problem. But even mild empathy gets me to the response above.)
The only relief for tight airline seats is a few drinks to dull the misery.
The worst part for me is my shins are long enough my knees & thighs are elevated off the seat, causing the blood to pool. I have wondered if economy plus allows enough leg extension to alleviate that problem.