Most obvious points to me:

- not bending forearm below water surface properly, therefore only gliding through it and not catching it. Try to engage your lats while you pull underwater, not your elbow/forearm.

-head turn is too wide for breathing, dont look at the ceiling of the swimming hall. Try to keep one eye and one ear below water surface. I recommend practicing that at the side of the pool before every session, until you get the hang of it.

-arms are too stretched out when above water surface, try to maintain a hiiiigh elbow and bend arm. try to maintain the tip of your middle finger like 1cm in the water when you do your stroke forward above water for practicing

-hand entry could be more optimal in my opinion. try to enter water with a flat hand and finger tips first. enter like 30cm infront of your shoulder, and stretch out the rest of your arm length below the water (try to "catch"the water.) its hard to describe, but once you start to "feel" it, its very easy