How are you supposed to keep a conversation going

Lately I’ve realized that I seriously cannot keep a conversation going. Someone will talk to me about something, and in less than three minutes I’ll run out of questions to ask or things to respond, even when I find the topic interesting. I genuinely would rather listen to them talk than do so myself, but then that’s basically the same as talking to a brick wall. Does anyone have tips on what to do or how to come up with things to say?