Best trick IMO is to take prebiotic fiber while fasting.

That way your gut bacteria gets fed and doesn’t get desperate to tell your brain you’re starving.

Personally I don’t feel ketogenic state is reached from 16 hours. Feels like I need at least 24 hours, but usually do 36. Only thing I need other than water is electrolytes. I would get bad headaches without my mineral/pink salt.

Another approach that had some popularity a bit ago was "VB6" - Vegan Before Six (pm).

Mark Bittman's VB6 Diet - https://www.webmd.com/diet/a-z/mark-bittman-vb6-diet

Vegan by Day, Glutton by Night? Thinking About VB6 - https://www.bittmanproject.com/p/236239_vegan-by-day-glutton...

You can find other posts of people trying it.

Try having an early dinner rather than skipping breakfast. I've been doing it this month, going alright.