Unfortunately for the 1070 I am afraid you are right. It is best at mining Zcash and Zcash profitability after the ASICS hit the market is worthless with GPU-s now.
That's the main reason. Even for 1080 Ti, Zcash was one of the most profitable coins to mine, but those times are long gone.
Probably you can put it to mine Cryptonight V7 and it will at least do better than that.
According to whattomine.com, Cryptonight V7 is not going to save the OP. It suggests Lyra2REv2 and X16R as somewhat better options, but the differences are small.
I used to mine with 1080 Ti and it was really profitable. It is sad to see how quickly the GPU mining situation has changed for the worse.