I don't have any problem with other people having different views from me. In fact, I prefer it. Diversity of all kinds makes the world much more interesting than it would be if everyone were identical. Have you carried out experiments to test the effects of genes, environments, nutrients, and experiences on living things? I have. The arbiter of truth is evidence. My conclusion follows from the evidence.
My definition of free will is a will that is free from determinants and constraints. To prove me wrong, you would have to do the following:
1. Live forever without consuming any oxygen, fluids, or food.
2. Do things other organisms e.g. tardigrades, dolphins, chameleons, etc. can do.
3. Teleport everywhere and everywhen.
4. Prevent all suffering, inequality, injustice, and deaths.
5. Make all living things (including the dead ones and the never-born ones) forever happy.
6. Be all-loving, all-knowing, and all-powerful and make all the other beings also all-loving, all-knowing, and all-powerful.
7. Own an infinite number of universes and give all beings an infinite number of universes each for free.
Once you have done the above tasks, I will be convinced that you have free will. If I had free will, I would have already done the above tasks.