MRVL roll

Sold Aug17 21c and bought Aug17 22c for .64 credit. Rolling long call delta down from 76 to 63.
Still holding Jul20 22.5 short call for extrinsic.
My goal is to pull enough cash out to cover the trade. This tactic only works in a rally or a bullish trend. I won’t share all of these trades but a couple people asked for more info. @mortlightman