I have found Mule deer to be rather curious creatures. They tend to come to things they cant see or descide what it is, until they can be certain then run away if frightened.
One way to get a bucks interest up is use scent trailers on your boots. I use them, and put doe estrus on them. Then just hike up to a ridge or highest place I can head to in the mornings, retrace my steps in the afternoons. The scent gets them interested obviously, as it also can help to hide your own.
I use an hoochie mama squeeze call when walking too. If for any reason I make a loud noise, I will then call with it once or twice like a lost cow.
It also works to use it one or two times when closing the distance on a spot and stalk in heavy cover on mulies too. Being elk are generally not too quiet in the woods, it will settle them down if they hear you coming on the ground.
Predators tend to walk SUPER quiet, and deer tune into this when your stalking them, the soft foot approach spells trouble and they bolt.
One year I took a doe bow hunting this way, and everytime she looked at me I would stop, and cow call. I closed the distance on her to 45 yards and took a shot, missing her. She just looked around not sure what it even was, I kept up the game and closed into 25 yards, taking a calmer shot, took her with a beautiful broadside hit.
Her hearing the sounds of an elk call, along with a patient foot stalk through the timber made for one fun hunt that year!
Every guy has their own advise, I personally love the foot stalk better than a sit on my butt and freeze a finger or two one. Hope that helped and good luck this year!