From:Secret Admirer

Hello! Saw you inquiring about photocards. There is no secret! Just interact as you would, every time you like or comment, even follow someone, youll have a chance at drawing a photocard!

Thanks, that's not much different from what I read in the FAQ. But I guess without knowing the exact weights for each action or probability of a card drop, there's not much advice to give. I appreciate you reaching out though, best of luck yourself.