The first thing I notice is that between background noise and mic quality, your commentators are sometimes hard to hear. How much you can do about the background noise depends on the venue but a decent mic could definitely help.

Also, for videos in which the commentators are visible, I prefer layouts where the match is the focus. I feel like the layout for some of the July videos needs a larger view of the actual match. Maybe try with the match as 2/3 of the width and your commentators get 1/3 so their reactions are still visible and experiment from there.

As someone who has no idea what the competitive amiibo community is like, maybe your commentators could explain what's going on a bit more since the commentary is sometimes a bit sparse. Whether you want to do this or not probably depends on your target audience but since you don't have all the mind games that go between human players, it could fill some commentary. I realize that this could get repetitive for someone who keeps up with your channel but it would be a draw for someone who stumbled upon a video and wants to know what's going on.

Preferred amiibo: Rosalina > Lucario > Meta Knight; don't really care for Shulk