I have an evergreen magnolia tree in Northern Virginia, USA. It's about 25 feet tall, but it sheds leaves all year long. There are lots and lots of leaves. I think it loses leaves because the body is overgrown. I'd like to prune the tree to keep the tree healthy and lessen the number of leaves that fall. I've included pictures of the tree as a whole, pictures from underneath, and a picture of the number of leaves that have fallen in one week in late April. I appreciate any help you can provide. Thank you.