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Hopefully, this article will answer your question: https://www.gardeningknowhow.com/edible/fruits/sapodilla-trees/growing-sapodilla-fruit.htm

In order to ask a meaningful questions about plant disease, you'll need to be able to describe the appearance of the affected parts of the plant. Regarding leaves, think about such things as the color of the leaves (tan, dark brown, yellow,) shape (curling up on edges, or down on edges, folding from center vein, etc.,) spots ( yellow, brown, black, with or without holes, dry or moist, discreet edges or blurry areas, etc.)
The most important defense agains disease and pests is a strong healthy plant, so you always need to consider the culture of the plant. Sapodilla needs a lot of water, so this is the first thing to make sure of. Here are a couple of articles that will help you with the care, and tell you what to look for in terms of pests and pathogens: https://www.gardeningknowhow.com/edible/fruits/sapodilla-trees/growing-sapodilla-fruit.htm
http://edis.ifas.ufl.edu/pi054
The very best approach to dealing with plant problems is to get an expert diagnosis in person. You can take samples of leaves, also branch and soil, to the nearest horticultural station. Information on these should be available through the nearest botanical garden.

How old is your sapodilla (chiku) tree? Seedling trees bear fruit in 6 to 7 years or more. Grafted trees may begin to bear fruit in the second to fourth year after planting.

Do you know which cultivar you have? The UFL site for Sapodilla trees suggest that some cultivars can self-pollinate, but others not (http://edis.ifas.ufl.edu/mg057).

For the time being, I would double-check the care of your sapodilla with regards to your watering schedule and fertilizing at the following link:
https://www.gardeningknowhow.com/edible/fruits/sapodilla-trees/growing-sapodilla-fruit.htm

Fruit drop can be due to drought conditions.

Here are some links to help you with care information.

https://edis.ifas.ufl.edu/mg331

https://www.gardeningknowhow.com/edible/fruits/sapodilla-trees/growing-sapodilla-fruit.htm

If the tree does produce flowers but no fruit, this could be a pollination problem. You could try hand-pollinating if you are not doing this already.
If there are no or very few flowers, you could try adding additional phosphorus and potassium; see this article for advice:
https://hort.purdue.edu/newcrop/proceedings1996/V3-439.html
If there are small fruits that fall off the tree, this could be the problem:
https://www.gardeningknowhow.com/edible/fruits/sapodilla-trees/sapodilla-fruit-dropping.htm

Pruning should be done when the tree is most dormant. Remove only the damaged parts of the tree, back to a main trunk of the tree.

https://www.gardeningknowhow.com/edible/fruits/sapodilla-trees/growing-sapodilla-fruit.htm