The easiest thing to do is make friends with plenty of people IRL through a shared hobby or interest. Those that are interested in being FWB will make themselves apparent over time. Just be honest and when appropriate, let people know you’re DTF, but not looking for anything more than sex right now.

There aren’t many people not looking for long term monogomous committed relationships. There might even be none in your area depending on your age and other factors. But that’s the best advice I can give on the matter.