Need help with picking a test

#1
Hi folks,
I'm running some numbers for a friend who makes instructional videos for different industries (using machines, certain tools, etc.). He has about 100 videos he's tried to sell, and has given me the number of downloads for each video, the different categories they fit into, and the price per video. For the categories, each video can be classified into a max of 3 main categories with 23 different classifications (1=laser lathe, 2=3d printer, 3=laser sander, etc.,). Each video is limited to 3 classifications, and some videos have only one or two classifications they focus on.) I'm trying to help him determine which subcategories to focus on to make better use of his time in making these videos.

Can someone help me determine what kind of test(s) to run? I'm copying part of the excel file here below for a reference...

Matt
Price downloads clip Released Length CAT1 CAT2 CAT3
5.99 5.00 1.00 2/13/2017 4:49 5.00
5.99 5.00 2.00 6/28/2016 4:55 7.00 8.00
5.99 2.00 3.00 1/26/2016 4:47 5.00 3.00 7.00
10.99 3.00 4.00 2/27/2017 10:0 11.00 7.00 18.00
8.99 .00 5.00 9/4/2017 8:14 3.00 13.00
5.99 .00 6.00 8/6/2017 5:23 7.00 8.00
5.99 1.00 7.00 2.00 3.00 12.00
4.99 2.00 8.00 8/23/2018 4:22 2.00
5.99 3.00 9.00 8/27/2018 5:02 2.00 15.00
6.99 .00 10.00 11/21/201 5:39 7.00 19.00 8.00
6.99 .00 11.00 9/26/2017 6:12 8.00 13.00
7.99 2.00 12.00 3/13/2017 6:42 20.00 7.00
6.99 1.00 13.00 4/25/2016 5:44 7.00
5.99 .00 14.00 6/21/2016 5:24 13.00 7.00
19.99 1.00 15.00 7/9/2017 7:00 1.00 14.00
7.99 5.00 16.00 7/12/2018 7:00 1.00 14.00
6.99 .00 17.00 4/30/2017 6:25 15.00
4.99 .00 18.00 10/24/201 4:39 7.00 4.00 8.00