Try getting back into a normal routine as soon as possible.

That is very good advice. I will do that next time.

I have travelled quite a lot for work and been lucky to do a bit of travel for leisure too. My work flights could be a challenge with not much sleep the night before the flight and difficulty sleeping on the flight and time differences. If it is daytime on arrival at destination stay up and do what you can, have an early night but don’t sleep on arrival. This has helped me get into the swing of things much faster. I would go straight to work from airport ( not by choice) and this did get me into a good routine from day 1. I try not to eat the salty snacks on the plane and keep drinking plenty of water.

A routine/schedule also helps with jet lag.

Water, sleep, small amounts of food, comfy clothes and rest breaks.

Drink lots of water before, during and after your flight. Staying well hydrated really helps. And sleep. Lots of sleep