There are tons of topics you could criticize. Are these supposed to be educational or just comedic?
For comedy these come to my mind, "People of Walmart," "Driving," "Horrible Youtubers," "Bad Videogames," etc...
For educational/pick your genre, "Movie Reviews," "News Updates/Opinion," "Video Game Reviews," "T.V show Reviews," "Places you can visit," "What they don't teach you in school," etc.
These are just some of the ideas that come to my mind when I think of "criticism."
PS. I couldn't get to your channel through your channel link cause it's not the url. But I was able to find it on Youtube
Best of luck! =]