A few things are really useful:
1. Your personal experience of my page. How you got here, what you're looking for, what you expect, how far you scroll and how often you check, the things you love the most.
2. Constructive criticisms: what don't you like? What errors are you seeing me make? How could I do better?
3. Strategy suggestions. Do you have any ideas?
4. The things I'm doing well. What do you like seeing? What should I do more of?
5. What affects you? What makes you message me more or less, or unlock messages or not?
5. Or just anything else you'd like to say!
— Aella