Good serve. I'll take a closer look later.
1. Minor differences from serve to serve start to be magnified at this level. So pay attention to the little things. As you practice over the weeks and months, you'll start to become very familiar with your serve. When you hit a very good serve or a very bad one, pay attention to the why and those are areas to work on.
2. For me, ball toss is still one of the most important things. If it varies even by a little bit, my power and consistency drops a lot. By a lot, i mean more than you would think, so it's something worth paying attention to. I use a radar when practicing so i'm aware of this, but since you don't have one. You'll notice most of your serves bang the back fence around the same height, within one foot range. Assuming same spin and location, you can use height as a proxy, plus how heavy the ball is, meaning if it bangs hard on the fence and it's still on the way up. Your toss looks pretty consistent, so i don't know how much of a factor it is for you, so just pay attention and see if this makes a diff.
3. Balance and momentum and kinetic energy. It doesn't seem like you pay attention to these, so you're losing out on a lot of power. Except maybe in using it the wrong way when you net the ball cause i think you're trying to land more into the court thinking it will get more power, but it just causes consistency issues, less power, and you running into the court. When you look at top servers like Fed, they land on one foot very balanced; no need to run thru your serve. Like i said, being balanced gives more power. Yes, you can land in the court, but not at the cost of balance.
Look at where you land. Put your finger or mouse pointer on the spot, and see what happens from serve to serve. It varies. The best servers have this figured out and land in the same spot i.e. Roddick. Sometimes, you land more forward than others; other times you land more to the left. This tells me you'll doing drastically different things with your body, and your momentum and energy are going in different directions every serve. On the one you land more to the left, i think you over-rotated your trunk more.
Think of this as some butterfly effect where little things can make big differences. You're wasting energy by landing left/right and front/back. You're not really paying attention to your balance, momentum, and energy yet so there are huge gains to be had. Your not falling to the left badly like beginners, but you do have minor variations compared to pros. Like i said, this is the time to start paying attention to these little things that i wouldn't normally mention to beginner or intermediate servers.
You seem lost on where the energy should go, so let me remind you. The kinetic chain starts from the ground and travels up. If you serve enough times, you should become aware of this: it should feel like a wave moving and traveling up thru your body to your arms.If you move a body part too soon, then the energy has not reached that stage yet. If you hesitate, then the energy will be dissipated and wasted. Try to feel this wave, and let it guide you. If you don't understand what i mean, just try to do it by feel. Now the key is this, the wave or energy needs to reach your arm. Since your arm is overhead, then all your energy will be directed to where your arm is pointing (at the point of contact obviously). IOW, it should be up and forward.
If the above doesn't make sense, try not to land more forward into the court. It's suboptimal. Think more 'up and forward' since that's where all your energy should go to: your racket.
To sum up, pay attention, ball toss, and balance/momentum. Kinetic energy if you understand it. I mentioned the kinetic chain, but my tip isn't really about the chain so it's a bonus.