Twice a week at the minimum with your type of content. I would try to upload more though.

But the main thing is to never stop uploading, and find videos to make that are different.

Think of something you want to do, and look up videos on it. If those videos are already super popular(500k+ views) then that topic has been saturated. Find something with low amount of views on something you would want to watch yourself, and make a video on it.

Example, one of your videos titled "scoring the perfect volley." I searched that title and 2 of the top 3 videos had a combined 1.5million views. And the 3rd one being a tutorial(Tutorials rank very high in the algorithms because they are helpful towards people)

Most videos are found using the search function. This is the easiest way to shine. It is when you have a great new idea at the right time, and people are searching for it. You just have to know how to use your sources and research doing the correct video.