Adding Tags to YouTube videos

My guess is that you should email to have them manually add the tags. If it is on the "Rumble Viral" channel, then that means someone actually reviewed and manually uploaded it. I would assume they added appropriate tags then, but don't know for sure.
Thank you for the reply friend.

I have software with which I can see tags, and they are clearly not appropriate, and wont fetch much views in the search engine with that.
I have noticed that even after having 150k videos on rumble channel, the views and Subscribers are not that great.

I to some extent know how YouTube algorithm works, and if the staff wants I can maybe help them with proper tags for all of their videos.
This would definitely help to gain more views through search as well, because the video would rank on different search terms because of the tags added to the videos.