Tips on how to wean baby from formula

Baby is almost 12 month old. He still takes total of 24-26oz in 24hrs. He is not a big solid eater but when he likes the food. He eats a lot. Should I control how much formula I give him. Because he takes whatever ounces I give him which is 3 7-8oz and one 3-4oz. But if I feed him less formula, will he eat more solids? Personally, I don’t wanna transition him to Whole Milk at the age of 12. So any tips and advice how to wean baby from a formula would be great. I read some cold turkey success stories but not sure how to do that.