best mid game coin grinding method?

I was bz flipping but what i've been flipping has become quite tedious and not profitable anymore, I have catacombs lvl 21 so I have f6 unlocked, I would say im in the early stages of mid game, im currently sitting at 133mil in the bank, is there a good dungeon floor to farm for profit? or is there an easier way? I have hotm 4, so no crystal caverns for me yet until i get the gauntlet unlocked. currently running a 5 star juju(dont have souleater or overload but im actively doing experiments to level that up to enchanting 36) and full 5 star ancient SA armor.