Please, share your method.

I looked up an artist there (Dio), and then an album (Holy diver). Neither page helped me find "similar" music

Look at the user lists that the band/album is included in. The title of the list should give you a good idea of what else you'll find on it.

You can also click on any one of the band/album's genres and look at the charts.

find the bands listed on metal-archives and check the "similar artists" tab, also the side-bar sources from r/metal on reddit