Nearly any scene is suitable to sell as stock… as long as the basics are covered:
-Composition
-Exposure & Focus
-Titles & Keywords
Some of the photos you share seem to have some potential, all are either too dark, are blurry thumbnails and impossible to see what your composition is.
I am often brutally honest. The sincerity in your question gets lost in the effort you put in creating this post. What that tells me is that you’re not putting enough time checking and editing your photos before you submit them. And frankly, that is the main reason your photos are being rejected.
Slow down and pay much more attention to what you shoot and when you edit.
Do it for the love of photography, always striving to do your best!