1- We know by our inner self that we choose our actions. We don’t feel anyone is forcing us to act. We essentially feel our free will.
2- God is just. If He decides our actions then it would be unjust for Him to hold us accountable for them. And we know Allah is not unjust.
3- Allah clearly says in the Qur’an: Indeed Allah does not change [the condition of a people] unless they change themselves. This means that we are the ones who make the change, otherwise the verse would make no sense.
4- Allah Has a system, and He designed all the laws and conditions of this system. We cannot change that. But part of Allah’s system is to give us free will to choose and act, so whatever we end up doing is within His system because He allowed us to choose and act on our free will.