Many video makers wonder how many clips they have to produce and upload to stock each month in order to make enough money to become professionals.
Again, there is no single answer: much depends on the expectations you have and what you want to achieve economically.
It also depends on how much time you have available. If you also have another job, you will have to make do with fewer clips: in any case, it is better to go for quality over quantity. Uploading clip after clip just to make up numbers is not a good idea. Every clip must have a concept and must be useful to someone: for this reason, it is important to loot at it from the point of view of the potential client or audience and interpret their needs.
If a clip is successful and sells, there is no point in producing other clips with the same subject matter, as it would simply divide the number of sales. Rather, it is useful to analyze the characteristics that made it so attractive and to present them on other clips.