You have my sympathies but you’re never going to please all the people all the time. There may be people travelling across many time zones and their light requirements may be the exact opposite of yours.
The only practical suggestion is window seat controls the light. If you can’t get one then you’ll have to put on all the cabin/reading lighting you can.
Conversely if it’s too light you’ll have to put on the eye mask.

There is no solution or compromise that’s suits everyone. Sorry.

Have you thought of becoming brexit secretary?