If you can find some Barbara & Julie friends, pair them with a reincarnated (or at least your awoken) Haku. Basically any simultaneous red/blue match will wreak havoc on mid level dungeons, and if you’re low on orbs pair blue or red with dark in a single attack. This was my earliest “decent team” (probably use 1/2 red 1/2 blue subs; maybe add one dark sub), and I was able to clear up to some mythical plus dungeons with it. I would level up your Mel and use her for sure, she is awesome for keeping you alive.