Outdoor malls, hobbies, gym, parties, libraries, book stores, parks, heck ask chatgpt.
F society who says you can't talk to strangers, those are losers. Say Hi, ask about jobs/hobbies, if they arent interested, you can tell from body language. Tell them it was nice talking to them and leave. They won't remember how you cold-opened, heck in 3 days they won't remember you at all.