MarxistIf that means you need to dress up in a tuxedo and speak 18th century English
...is there any chance you could do this? Just for one cast?
Seriously, we can see that your casting is well-received by people who understand the game and take it relatively seriously. For people less into comp TF2, or new to it, I would think your goofball zaniness would be more accessible, particularly since TF2 is a pretty zany game itself.
Obviously, sometimes it's good to be professional, such as when you're casting big high-level matches on TFTV. And when you do that, you are more professional. For your own casts, you do it how you want. Plus, being more professional, focused only on the game, no tangents, catching all the action, etc; that's obviously more difficult. Which is highly relevant when you're solo casting and doing your own camera work. If you were to try and do what this guy seems to want you to, I imagine you would get considerably less casts done, and enjoy them less. Neither of those are things we want.
Finally, people watch different casters for different things - energy, humour, and high-level analysis are the three big things which spring to mind. Of course, you've never played comp TF2 at a high level, so that potentially limits your high-level analysis; but your energy and humour carry you through any issues there and make your casts really enjoyable. Keep them as they are.