Wow, going for the top right out of the gate. Most of us play in a few state events, club championships, etc... to get a feel for how we react to serious competition. My only advice is remember it is just golf, a game, and enjoy the day.
When you say "more vertical at setup" is they caused by using a higher lie angle on the irons, or something else?
He mentioned he uses 73 degree lie angle but that was from around 2018, while.the video is from 2020, maybe he lowered them?
Or if not, what else can cause you to be more vertical at setup?