Some thoughts:
Try to find where two or three tree trunks are growing up close to one another and get in between the trunks. Poplar trees around here will sometimes sprout three good-sized trunks from a single bole.

Try to keep from getting silhouetted - hug the tree and/or lay your upper torso and head against the tree when deer approach.

Climb higher. (How high are you? - I usually like my platform at least 20' high and will occasionally get up to 30').

I hunt trees, not deer, lol.

-fsh