I can’t sleep on planes either, but I have a whole routine now.

The main thing is timing the flights, and never flying > 6hrs unless it’s a good lie flat.

Going west to east, you HAVE to leave at night. This way, I can get a few hours in at least. I take me red glasses, avoid eating, do some work until I’m tired, and if I need it, take a gummy.

Flights back east to west are easier but must be done during the day. In this way, you can ultra productive the whole time and then go to sleep when home - so that’s never a huge issue 

 I’d just add west to east flights get into 2-4 hr less sleep night before travel. Box breath whenever you wake during flight soft sleep blinkers and sound cancelling ear plugs. Get them to turn heat down in cabin to minimise dehydration.