Around that age DS started to branch out a bit
Combination of strict rules and laying off the pressure, if that makes sense!
Strict rules: you are polite about food that someone, anyone has prepared. No faces, no negative comments.
Lay off pressure: prepare some new foods occassionally, but often have a "safe" standby too (my DS can eat rice with anything, so often had a bit of plain cooked rice as an option too).
Other than that, we don't talk about his food issues, the big thing is: it is fine to not like certain foods, it is NOT fine to make faces/comments/pushfoodaround plate with face of doom
.
I make sure I don't praise or scold, just let him get on with it.
funnily enough, he started becoming more adventurous by himself.
He eats most things now (13)