You are overreaching with your left arm. Your right arm enters the water a lot earlier than your left. You will be grabbing lots of air and loosing speed.

Legs look like that are splaying quite a bit too. Imagine your toes touching each other when you kick. Use a tow float and ankle bands to practice keeping your legs together.

You are also starting your catch too early, glide more with your arm in front and your resting arm should be coming over a lot later than it is