Kudos to you for mixing metal! I’ve done a few giant house parties full of metalheads and they were the best crowd. There was even moshing after a few drinks, just had to work them up to it. Tracks from bands like Enslaved, Emperor, Immortal, Bathory, Gorgoroth etc. are well suited for insane mashups and radical mixing, throw in some death metal tracks from Morbid Angel, Immolation and Cannibal Corpse along with old school thrash like Testament, Exodus and Overkill and some Doom Metal as well, the sonic possibilities are endless. As far as continuing to learn, you’ve come to the right place. There are some great courses here at very reasonable prices that will advance you quickly along your DJ path. Keep asking questions! There is a lot of experience at DDJT and you’ll usually get a few helpful responses.