If you're having trouble thinking of something to say, don't say anything.
No, I'm not going all Confucius on you (although that IS good advice in many areas of life.) Currently we have a glut of all kinds of media - books, videos, songs, there is a LOT of all of it. Many of them don't really have anything interesting to say, but they are desperate for somebody to pay attention to them... As if being heard somehow validates their existence as humans... So it looks like the deluge is not going to abate any time soon. If anything, it keeps getting worse as technology keeps making it easier to broadcast.
Even people with a burning message that the world needs to hear have trouble being heard these days. There's just too much background noise.
If you are stuck for something to make a video about... Maybe just don't?
CAVEAT: If I misread your first post - if you do have something you really want to say, and are looking for the best way to say it - ignore what I just said.