TBH I don't know whether you're doing the right thing or not, all I know is that food issues are really, really common at this age and we're having them too. I think lots of kids don't like much meat or green veggies but will eat lots of fruit.

My approach is much the same as yours has been. Always put something on DD1's plate that she will eat, along with other stuff. No fruit after dinner unless she at least 'tries' the other stuff and no yummy dessert (if we're having any, which is not often) unless she cleans her plate. Stuff she will eat: pasta, mashed potato, roast potato, wedges, roast pumpkin, peas, chicken, sausage, rice. So there is always one of those on her plate which makes dinner reasonably simple as I either cook a pasta, something with rice or meat and two veg.