Q.My orange tree is not producing big oranges
I bought my house last July and it had an abundance of oranges. This year it still has a lot of green oranges, about 2″ in diameter. What do I need to do to get the big oranges I had last year?
Changes in the environment can effect production and fruit size, which is mostly out of your control.
Watering, good soil conditions, fertilizing and keeping the tree free of insects and disease are where you can improve the chances of healthy tasty fruit.
Here is a link to refresh you of the care requirements.
https://www.gardeningknowhow.com/edible/fruits/oranges/no-fruit-on-orange-trees.htm