Right off the bat, you have 0 variety in your approach. You literally just run at him with a nair, which is very easy to get around if you do the same thing repeatedly. Vary your timing, come in with bairs, grabs, etc. There's a variety of ways to approach, but mostly you just need to not run straight at him every time. Wait a little bit, see what he's doing. Dash dance longer, maybe double jump in and waveland back to draw out a response, etc.
In fact the commentator told you to stop approaching with nair lol.
Also, you need to work on your general speed of pressure. Several times i saw you nair through his shield and then pausing for a bit, and he would escape. If you're pressuring someone's shield you HAVE to keep moving. Come back with a grab or another aerial, but do not wait or give him a chance to think.