Swim Video for review

 There are technical things to be fixed. 

To be clear, while they should be fixed, even if you fixed all of them, you will get barely a 5sec/100 improvement in speed - that's just the reality of technique.

Good things:

- You're pretty flat in the water

- No fishtailing

- No big headbobbing

Things to fix:

- Underreaching on the extension - you want to reach far out and rotate the shoulder slightly forward to get maximal arm extension. It's particularly bad on your breath stroke - when you breath, your extended arm immediately drops. Keep it out there.

- Overrotating on the breath (corkscrew effect). Swim flatter (I know, counterintuitive, but it'll give you some speed.) You also can turn your head less on the breath.

- Can tighten the kick up -it's giving you some drag. Google "ankle band swim" to see a challenging and good drill swim to help fix this

- Dropping elbow on the catch, but that's expected in pretty much all non speedy swimmers.

Overall not bad! But by far your swim speed limiter is your limited stroke power. The arm turnover is slow, and the catch lacks force. Don't get fooled by folks who claim that you can drill your way to a great catch. You cannot  "technique"  your way to a powerful, efficient "early vertical forearm" catch that will propel you at sub 1:20/100 pace - you have to work hard to build the muscle and aerobic capacity to maintain it.  Gradually increase volume and speed during workouts while remembering the little things to fix above, and you'll improve, likely a lot.