Similar content

Fonts are very specific file types. Customers source their Fonts from Adobe Fonts, not from Adobe Stock images.

https://fonts.adobe.com/search/fonts?query=Japanese%2BKatakana%2BGothic

Stock customers come here in search of vector graphic letter styles that fit with a particular theme. As you can see, this is English in a Japanese letter style, which is very different from what you're offering.  Know your marketplace and the customers that use that marketplace.

If you want to be a font designer, design actual font files, not images of fonts. 

Hope that helps. 

Yes it's frustrating to receive unwarranted rejections. Some have suggested changing the file slightly and resubmitting. Sometimes it gets accepted on the second try.

You are not addressing an Adobe employee here. As we have stated several, several times before, Adobe believes their new criteria for rejections based on "similar content" is working fine. 
So deal with it. We are all facing and coping with the increase on rejections. If you need assistance on what you might do to resubmit, look through earlier post.