Try asking a question like, “I am interested in exploring non-monogamous relationships with the people I date. Do you have any experience or interest in non-monogamy?” While this might feel intimidating, being upfront and open with your relationship hopes will encourage a conversation. You might find others are also curious or have something helpful to offer from their experiences. https://www.lgbtqnation.com/2022/12/is-non-monogamy-for-me/