TANAP pipeline is a farse. Everybody in the gas business knows that. Azerbaijan can not fill even 1/10 of its capacity. You'd better improve your relations with Russia or you'll end up as an American colony as Ukraine Nulandistan.
There is always the option of shipping in gas from Turkmenistan. But it is not going to be easy. China is importing almost all of the Turkmen gas, and I am not sure whether the Turkmen fields are having any spare capacity. Also, constructing a pipeline across the Caspian Sea is going to be insanely expensive, and given the low prices of gas, I don't think that it is going to be economically viable.