Hello mommies... what food to introduce and how gradually?

My baby is a bit picky, some food she likes, some she will reject. She really likes pear, apple, banana puree, oat cereal. Rejected avocado, sweet potato, yogurt. I always mix in breast milk with the puree/cereal to make it more runny. Slowly reduce the breastmilk and thicken the texture after some weeks.