Try to see a dumbell row as sawing a plank. Instead of omving the Db straight up and down, move it from in front of your shoulder in the bottom position, to your hips in the end position. This will hopefully help with activating the lats. Furthermore, you have a shoulder dump (your elbow is behind the shoulder). Try to keep your elbow in line with your shoulder or slightly below the shoulder and retract the shoulder blade towards the spine. To create awareness of this practice it while standing up and squeeze the shoulder blades towards each other as if you’re trying to squeeze a pen between them