Nice video and production. I've raced a lot over 20+ years including as my job many moons ago. Here's some observations that hopefully are of some benefit (times are as per the youtube video). I am being fairly direct here with my critique - please don't take it as flaming, it's meant to help you improve.
Key message - based on the vid, you physically have what it takes to win that race. No question. You just need the right mindset and tactics.
1:27 - yup, you don't want to be on the front. Just keep spinning 90-100rpm in an easier gear and soft pedal it until someone comes over you. That way you don't fry your legs and you get a nice warmup.
1:32 - you push the pace a little. Too early in the race for that - as someone said "you have to lick your opponents plate clean before starting on your own".
2:02 - general observation that some riders in the race seem to have their seats a little too low and then stems a little too high. See 2:02 and 2:44 for example. They are losing out on power big time.
2:50 - I would like to see you a little closer to the back wheel in front. Not much, you are pretty tight, but you could go tighter. Experiment by 1cm increments until you get comfortable with each tighter increment.
3:00 - Initiating the Attack. Good bits first: you were decisive went hard and went smoothly without too much rockin and rollin. Out of the S-Bend was a good spot but not the best.
How to improve the initial phase of the attack:
(1) Attack goal. You didn't have the right goal for an attack that early in the race. You spooked yourself fearing another attack and just went without the correct plan. For an attack that early in a crit, your goal of getting away and then hoping a group bridges is too unlikely to make a consistent return on investment. You goal for an attack that early should be to split the group - ie whittle it down. If you want to get away solo or get away and be joined by a bridge, you need to wait until later in the race to increase the odds of success.
(2) Attack location. The best tactic, particularly for a bunch where the guys further back appear to lack some confidence and/or skill is: 80% attack into the S-Bend then 100% attack out of it. You should practice it in training so you are confident going into the bend REALLY fast. Others won't be so confident and will brake or soft pedal leaving gaps. That means you will not only get away but also split the group.
3:19 - you need to be way tighter on the cones.
3:30. Attack mentality. You let yourself go a number of laps off the front without a winning plan. You were hoping for a bridge but it didn't come, which was always the likelihood that early in the race. Meanwhile you burned your legs which ultimately cost you when the winning move went later in the race. You needed to make a call after only 1 lap away on your own. Either you commit 100% to staying away until the end or you sit up recover and look for another opportunity. If you are committing then you need to have the mindset that either you stay away and win or you don't finish the race. Go 100% to get as big a gap as possible early. That's hard on a parking-lot course where you are always within sight. Then you need to suffer like never before. That's a hard hard road with that much of the race remaining. Me? I would have sat up and regrouped.
4:02 - Justin pulls the group back to you and you wish instead that he had come along. Next race, have a chat with Justin beforehand and convince him to attack as a pair.
4:09 - Your reintegration plan is correct.
4:37 - You move up on your own. Be patient and let someone else tow you up to the front.
4:57 - "Quite a line up". Maybe, but you are talking yourself out of the win. You need to believe you can beat these guys.
5:04 - The winning attack goes. You let the gap grow too big. Have a binary mentality at this point - ie 1:0, total win or total loss. Either you hold the wheel or you are out of the race. Focus 100% of your physical and mental energy on holding the wheel. The moment you hesitate you are placing your fate in the hands of others. Sure, someone else might tow you back up, but you just lost control of your race destiny.
5.13 - Last chance saloon. You NEED rider 711's wheel. Employ previous comment.
Good luck and remember that you are there physically, you just need to race a little smarter. Let us know how you go.