Try bringing your front elbow to your front thigh instead of putting your hand on the mat. From a wide stance, with your front heel in line with your back heel and your front knee over your front ankle, inhale and reach your arms up, creating length in your side body. Exhale and allow your pelvis to rotate. Sidebend over your front leg and place your front elbow on your front thigh. Putting your elbow on your thigh will allow you to more easily keep your legs active, helping you to balance.
See also 15 Poses Proven To Build Better Balance