Adam and eve had only two choices. Stay in the garden forever alone. This was not God’s plan. Or eat the fruit and fall allowing them to become mortal and have mortal children. They chose the latter and the rest is history.
You could ask why didn't God just tell them to eat the fruit so they would become mortal?
There really was nothing special about the fruit itself. The fruit was not what made them fall. It was disobeying God that made them fall.
God had to do something to cause them to fall but not make them do something inherently evil.
God could not force man to fall, they had to do it on their own so they could learn good from evil.
The only way to fall is to disobey God.
If He told them to eat the fruit then they would not be disobeying God and so they would not have fallen. He had to get them to disobey him somehow so they would fall and allow man to enter the world.
God could not flat out tell Adam and Eve to disobey him because by doing so they would be obeying him.
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