I expected to get flakes from tinder but after the fourth one where we set up a time and place, I'm starting to think this is not worth the time.

My general approach is to say something interesting / get them to reply, within a few texts of banter I say we should meet up for some drinks, are you free on X, there's this place I want to check out. Works decently well.

I try to keep it fairly non suggestive yet still straight forward "you're officially my new girlfriend" (jokingly), "I'm taking you out".

Should I modify my approach? Not sure if I should try to make it more casual like "oh let's hang out", or more flirty and suggestive.

It could also be a question of getting some sexier pics. Help.