I am not an expert on the best bands to get anyone specifically into metal music. These are based on my own experience.
As someone who has recently gotten into the metal genre, I found myself reflecting back on how exactly I got here. After some reflection, I found this is something that I have been working towards for a while, but was just too scared or intimidated by how heavy the music is to just jump into it.
However, since I took the jump, I haven’t looked back with the exception of how I got here. In that realization, I notice a lot of rock music is how I weaved my way into metal music. Some of the bands have made a resurgence in the mainstream due to Tik Tok trends or because they have recently blown up. I have found others that are nice to dip a toe into the water to get into metal.
There are plenty of other bands outside of these that can lead you into metal music, but these are the ones that lead me into the metal genre more. Metal music is so diverse, so if you are interested, check out this online map of the metal genre. I believe that if you like the songs linked in each of the sections, then you should dive into the bands more. You can even spread your genre out to metal music!