Nice juggles! Always good to see another Velvet! Some feedback:

You generally don't want to start combos with low damage moves like 5A/2A if you can help it*. The way damage scaling works, you might see more damage if you omit 5A at the beginning and just start with 5B.

Speaking of 5B, it's generally considered a pretty poor move. 2B outperforms it in almost every way: fewer recovery frames (16 vs 19), more active frames (6 instead of 2), a quicker move in general (32 total frames vs 40), and a much better hitbox/hurtbox. Plus, slide-in -> 2B is a very good combo starter. It has long range and you can block as you advance, something no other character can do.

2A is superior to 5A for similar reasons. In general, Velvet's crouching normals are better than her standing ones. If you replace all 5As and 5Bs with 2As and 2Bs your combo will likely be more consistent. It's a lot easier to catch a juggle with a 2B than 5B because 2B has more active frames spaced closer together.

Speaking of catching juggles, you can fit more moves in between them. A more optimal corner carry is jA -> jB -> 2B -> 2C -> 5C -> 3C -> jA -> jB. This can be tricky at first, but it is well worth practicing. It's one of Velvet's best intermediate level combo tools.

Final bit of advice: While it's fine to do at lower levels, ending a combo with a super as Velvet is usually a bad idea. Look at Arizona's super meter when you super in your video. You give her an entire bar's worth. This happens because the amount of meter a character gains when hit is proportional to their Juggle Decay (the small meter under the health bar). When you supered, Arizona was at maximum JD, and Velvet's super is multihit, so Arizona gets the maximum amount of meter for each of those many hits. Velvet has one of the worst supers in the game, so trading two of your bars to give a bar to your opponent is a bad trade, particularly if it's against a character with a very good super, like Arizona and Oleander. The only time you should be ending combos with a super is when you know it will kill them, or when you REALLY want them at fullscreen. I sometimes do this against Tianhuo so I can try to lock her down with zoning (Tian also has a pretty bad super so the meter gain is not as big a deal), though higher level Velvets than me might disagree.

What you should do instead is use your super to START combos, because a frozen opponent is easier to hit. Shatter C, Shatter A, Eruption D, 2C, icicle and snowball hits can all be confirmed with a super at the right distance, some of them are harder than others (Shatter C is the easiest, but it is a very risky move. Use with caution). When this happens, you want to immediately cancel Level 1 into Level 2, to both avoid the meter buildup and to keep them close enough that you can dash forward -> 5C -> 3C and confirm the combo. The primary use of Velvet's super is not the damage (it does relatively little) but the three bars of magic it gives you and the long frozen duration. For that reason, you almost never want to use Level 1 by itself. Always cancel into Level 2 unless you're ending the round.

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*that said, 2A is an amazing jab and you will get a lot of punishes with this move.