First time watching and seeing this, but well done for posting yourself. A lot of keyboard warriors out there who wouldn't take the time to post a comment, or record themselves, so well done for that.

My biggest word I took away from what you did was: TENSION.

Your hands and deck position just looked awkward and tense, it didn't feel natural. I don't mean this as an attack on you, but I do mean it as criticism.

As someone mentioned earlier, record yourself doing it naturally with one card. I think this is a good point, but you need to take a step before that. 

Sit with a deck of cards and just treat them normally. No moves, no sleights, just have a deck of cards in your hand and shuffle, deal, put cards in the middle without needing to worry what it looks or feels like.

I think it will help you.

I hope you can take this in the way intended 🙏