Yes definetly mix the sweet and savoury, this is what I did with dd to get her to eat protein as we were a bit late moving onto it due to reflux, Mix fruit and veg definetly and try everything. Also try sweet veg, sweet potato, peas, carrots , butternut squash, pumpkin,
Think,
Chicken with apple, mango, apricot,
Carrot and orange,
There are so many weird combinations out there so try them,have a look at annablekarmel.com
With dd I found she wouldn't eat my pureed chicken and veg stew but would eat a jar one which had apricot in it, so I tried my own and added apricot, she still wouldn't eat it so in desperation I added a spoon of plain yogurt one day, she ate it ,next day a bit less next day less, then chicken stew with apricot and then plain chicken stew.