One other trick you can do: mention one or two well-chosen things in your talk that are interesting and related to your topic, but that you can't go into further detail on (for lack of time). Say you'd be happy to discuss them after the talk with anyone who's interested!

This way, anyone who wants to talk to you has a freebie question they can ask (and that you have interesting thoughts on), which may lead to further conversations.

As a bonus, pointing out 1-2 connections like this usually improves your talk for everyone, by adding context.

Yes, I found that a lot of people are hesitant to ask questions when there are many people in the room (tbh sometimes even I feel like my questions may sound stupid when I'm the attendee). So I always hang around in the room/hallway so people can come and talk to me.

As someone noted, I always have my contact information (e.g., a LinkedIn profile) in my slide so people can reach out to me after the event and I actually had good conversations with people after conferences. Not only do I get feedback/questions on my presentation, but I get to expand my network.