Exactly. There are so many factors involved: how regular your normal routine is at home, your ‘normal’ sleep patterns and sleep dependency, how much travelling and how often across how many time zones, whether you find acohol helps or hinders the problem and so on. The best advice I can give is: beware those who give advice as if ‘one solution fits all’. Anyone who faces this problem on a regular basis will develop their own ways of coping, and to a large extent your own body tells you what it needs and how to cope.
I’ve always been very lucky in this regard. When I first started travelling in the 1990s, I could be hit quite hard by jetlag. These days I fly a lot more often to many different places, and I literally don’t even notice jet lag. I seem to be able to just switch to whatever the local time of day is. It probably helps that I don’t have much of a fixed routine even when I’m at home. I get up when I want, early or late, work when I want and feel like it (again, can be early or late) and just go with the flow of however I’m feeling at the time.
The only tip I can give you, that might help some people, is to have the right attitude of mind about it. Stop thinking about home, stop working out what time it is at home, stop mentally translating your experience relative to what’s going on back home (‘Oh, just think, they’ll only just be getting out of bed back home’). Just accept that you are where you are, look at the sky whenever you can (give your body chance to work out how to adjust its internal cycle) and accept the local time as the REAL time and the NORMAL time.