This isn't under review/feedback but I'd like to respond with my opinion and thoughts on this if you don't mind. Just ignore this if you don't want it, I've "blocked" the text just in case.
Summary
I feel the premise could be a bit more interesting. One of the thing that threw me off was the title, you might want to work on it a little more. Something to make it feel like it's not an isekai regardless if it is or not.
The other thing that bothered me was the relationship between the mimes and clowns, this could also use a bit more of a description. Q: Why do the clowns hate the mimes?
The last thing that bothered me was how detached everything in that paragraph feels. From the main character to the world building to the tournament.
I could see this story looking cool and badass.
Good luck!