Still brand new, give it time for difficulty adjustment - that is what miners are waiting for.
OR sell your Bitcoin Cash. Keep in mind that if Bitcoin Cash gets majority hashrate, Segwit Bitcoin has no difficulty adjustment except for default that takes two weeks, and the chain can literally come to a stop - that can't happen with Bitcoin Cash.
How long does the difficulty adjustment take? I thought it has already undergone at least one?
It goes down every time there are less than 6 blocks in a 12 hour period. There is also the difficulty adjustment that takes place every 2016 blocks.