Good openers have three traits: specific, easy to answer, and a hint of personality.
Find one thing in their profile that's not generic. Open with a reaction to it: 'Okay the ceramic bowl in photo three — is that yours or a flex?' or 'That Tokyo prompt got me, what neighborhood?' References like this get replies because they prove you actually looked.
'Rank these: mountain hike, city brunch, beach day.' Rankings are irresistible because they're low-stakes and reveal personality. Works especially well on Bumble where the other person opens.
'If you had to eat one meal for the rest of your life but you could change the location every day, what's the meal?' Silly questions reveal more than serious ones. The reply is often the start of the best thread.