how to treat the apricot tree for a good fruit?

Question

I have four trees of apricot, one tree of pears and one tree of cherry in the house garden I moved lately to. The fruits die after it is almost grown.

Answer 1

I would need to know more about what time of year this happens and how big the fruit get.

Since it sounds like it is across all of the fruit trees, it sounds like you may have a pollination problem. This would cause the tree to abort the fruit before it is ripe as the seeds are no good. These articles may be helpful:
https://www.gardeningknowhow.com/garden-how-to/beneficial/insect-pollination-process.htm
https://www.gardeningknowhow.com/garden-how-to/beneficial/creating-a-pollinator-garden.htm