OptionsPlay's Tony Zhang considers Alphabet (GOOGL) "more of a macro trade" reflecting the state of markets. He doesn't see much downside left in the Big Tech giant after the company was pushed over 20% off its all-time high. He urges caution in its search business long-term but argues its A.I. innovation remains in the "very early days." He offers an example options trade for Alphabet ahead of this evening's earnings.