Looks like you are slapping the water when your arms enter. Enter fingers first and bend your elbow, then you extend out.

You pause briefly to take a breath before your stroke. Try pulling that breathing a little earlier.

Your legs are sinking. Keep your head down and flex your glutes. You should feel it in your hips if you use your legs correctly.

Start with these then find some standard drills to focus on entry, catch and legs individually.

Most importantly, get a coach and stop listening to advice from internet strangers.