I experienced a huge drop too, but that was mainly due to me not giving a shit about anything for a couple of years since adult is still less than 1% of my income - I just love porn ;)
But I somehow ended up with
Sex Goes Mobile and had their account rep built me a whitelabel mobile version of almost every site I have. I then redirected all mobile traffic to that mobile version of my site url.com/mobile/ and it makes very good money.
And they payout in EUR, I love that cause the $ is low these days
You probably have 15-25% of your traffic that is mobile, use it man. and do hit me up on ICQ if you need anything.