Any reviews you can place will help build your overall online profile.
On the press side of the house aim for appropriate blog targets.
If you are just starting and don’t think you can draw a large crowd, hold a listening house party with wine tasting, cupcake bake-off, fondue party, etc.
If you are only using NFO files to restore from a backup of the library, or doing something like moving from a local library to My SQL, then you will want to use the normal scraper settings and not use the NFO-only option.
This way Kodi will still use the online scrapers for new videos, but only for those new videos that don't have NFO files.
Album reviews take a considerable amount of time and, if you look, most music sites are reserving these full album review slots for the most anticipated albums.
If you play live shows, book a release show and do something to make this show more special than the others.
If you did not "Set Content" when you added a source, you can do so later by selecting the source and bringing up the contextual menu ( You can also "set content" for subfolders, even if the parent folder has content set that is using a different setting.