I agree about not napping. It can make you terribly groggy, and we slept through a couple of times when we used to do that, while Lae afternoon. Which just made things worse.
I’m Australian, and was an expat for ten years, living in Singapore and Tokyo, with lots of flights to France (where my husbands head office was) So have dealt with jet lag a lot.
My advice is to try to sleep on the plane. If you don’t have early checkin at your accommodation, see if you can grab a shower at the airport (we’ll, that’s what we do, but our flight is often much longer than yours. We have a 23 hour flight before our upcoming August cruise from Southampton)
Then, just power through the day. Drink some coffee, and try to walk around outside for part of the time. Sunlight on the skin helps to reset your melatonin levels, making the next day easier.
With an 8am arrival, we would probably have a very early dinner (maybe at 5.30 pm, depending on how we felt) Then hit the hay hard at about 7.30 -8.00 pm.
Doing it this way, we tend to sleep through, then wake early the next day, adjusted and good to go.