How can I optimize form fields for mobile users?

I've been running my Shopify store for three years now, and mobile conversion has always been a persistent challenge. Recently, I noticed our mobile checkout completion rate was dramatically lower than desktop—around 35% compared to 62% on larger screens. Every time I look at my analytics, I see potential customers abandoning their purchase journey, likely frustrated by clunky, non-responsive form designs. It's infuriating because I know these are real sales slipping through my fingers. I've tried generic responsive themes, but they don't solve the nuanced issues of mobile form interaction. Touch targets are too small, keyboard management is poor, and the overall flow feels disjointed. My team keeps telling me that mobile users have less patience and will bounce faster if the experience isn't smooth. I need a strategic approach to redesign our forms—not just making them look good, but making them genuinely user-friendly and conversion-optimized. This isn't just about aesthetics; it's about understanding mobile user behavior and creating an intuitive path from interest to purchase. I'm looking for concrete, actionable strategies that can help me transform our mobile checkout from a conversion killer to a seamless, user-friendly experience.