an interesting thing is that you already understand some of your own faults. you say you don’t like how you carry yourself to the corner because you’re charging the slash elbow, and that’s obviously true. for the most part, all the things i say to new people apply here. divide alex into categories: meaties and options you use when the person in knocked down (typically high/low/throw mixup and hitconfirms), moves you use as mid-range pokes, moves you use as jump-ins, etc. once you narrow it down to the bread and butter options, you can start paying closer attention to the other person.
the main thing you did wrong was that roundhouse slash elbow was used way too often. it’s slow, unsafe on block and it’s rarely necessary to use something to cover that much distance. LK elbow is safer and faster. don’t even use the MK and HK ones. also, the ex version can punish unsafe moves like ken’s sweep. charge while blocking the sweep, then do the ex. free damage and often guarantees a cornered ken. also, alex’s sweep is fine but save it for max poking distance. any closer than that and it becomes a big risk, and you might as well focus on closing in for alex’s grappling/mixup game. also, huge overall error: i never saw you use meter even once. you filled it up, then held onto it the entire time. punish sweeps with ex slash elbow, or check alex threads for bnbs that use meter (and everything else too).
6:28 was pretty funny though. a lot of online makotos get away with really poor karakusas, but that was just horrible. but i think you know why that happened (stop doing that move).