I submitted a band called Emilyrose which was from Myspace only and release a demo, but I am positive it was accepted for being metal enough but got rejected for the reason as the subject, what should I do about that? and I have many more pending that are the same

To quote directly from the rules:
"the digital album must be available either as a full high-quality download, or as a stream from an officially sanctioned reputable distributor (such as Spotify, Apple Music, Amazon Music, Tidal, Deezer; this does not include YouTube/YouTube Music). "

If you believe a band likely does have an acceptable release but are unable to find enough evidence for us to accept, you can post in the research thread: viewtopic.php?f=17&t=104654