Beside being expert in the field about which they are going to make video, what are other qualifications needed to become a youtuber. Moreover, what do you think can make you stand out from others?
There are no qualifications.
If you are entertaining and funny and make videos of interesting topics you will get viewers.
Sometimes the best teachers are not "experts" in their fields. I remember one really good teacher from school. HE wasn't a professional teacher. Just a sub. And he didn't even know the subject very well.
(he often said that he will check how it really is for the next lecture, which he did)
But he succeeded in making the subject interesting and real. Something other teachers couldn't do. He was a natural teacher.