I feel you can't brute force 360 flips during the learning phase, without the right technique it takes too much effort and you'll face diminishing returns beyond 10 tries.
Yes, this is 100% correct and very wise to recognize. Overdoing it doesn't work, it will just wear you out all the while really making sure you firmly develop all kinds of parasitic habits. When your mistake becomes part of your muscle memory is when things really suck.
My analysis of the video is funny because it looks like the bail of someone who already can do the trick and just barely misses a random one. There is literally nothing you're doing wrong in it so I believe your barrier is completely mental, what I'm seeing you do here is you're about to catch the trick but then you deny it to yourself like it's supposed to be hard and so you're not supposed to win just yet. And so you have the reflex of opening your shoulders at the very last moment for the catch and you refuse it, but you don't look out of control at all. It sounds silly but I firmly believe this subsconscious self-imposed set of standards thing is something most skaters do until they realize and break out of it, it's a very personal tie to what one thinks they should or shouldn't be able to accomplish at large and the fear of disrupting that order. Now that's going in too deep for online tips on 360 flips but try pretending to yourself that you normally can do the trick as easily as a pop shove-it and are just trying to fix it because for some obscure reason it's not working that day. That's how I first learned switch flips, by pretending to myself I was fixing my normal kickflips just I was a regular footed skater that day.
Another general visualization tip, make sure the goal you're setting for yourself doesn't stop at just catching the trick, but feeling the roll away from it. Sometimes the current step of the learning process is an obstacle that takes so much focus it starts looking like the whole process and so you lose sight of your full ambition, micromanage things, and fall down a mental spiral that just takes you further away from it (that also explains 'madness' in skateboarding). In the case of your 360 flips that means make sure you visualize rolling away from your trick before you even pop it and then just kind of stomp where it will land anyway because you have the power of deciding that. If you don't do that then it's likely your brain will get stuck on 'well I personally think just the flip is good enough'.
tl;dr accept it for yourself that you can do the trick, and roll away like the champ you were all along.