It’s going to require a lot of experimentation.
For example,I find I can maintain an appetite by limiting desserts and snacks such a as cookies and ice cream. Don’t get me wrong, I have a sweet tooth, but I realize these will leave me not wanting to eat in a couple hours.
I can eat my lunch (nothing major, but likely about 600kcals) at 11:30 and although I’m “full”, I’m still hungry. This way I’m ready for a mid-afternoon snack (consisting of a protein shake w/ olive oil, fruit and nuts) and still once again be famished for dinner. For me I’ve found a difference between fullness and satiety.
Other things I’ve found that work for me are:
chewing gum always makes my stomach growl;
having a protein shake before breakfast (also with olive oil and fruit) since I eat my breakfast at work;
a real key item for me is my pre-bed meal which contains about 70 grams of protein and a fair amount of fat; and
train hard and often. This stimulates appetite.
Even though I’m not bulking, by doing these things and eating at least (6-8 times per day) I put on 15lbs in the last month.
Experiment but be consistent.