How to Keep Singular ‘They’ Clear in Group Scenes?

I have a nonbinary character who uses they/them pronouns and in group scenes a few early readers have gotten confused about who I’m referring to. For those of you who’ve written characters with singular they, how do you keep things clear when multiple people are in the scene? I’m looking for tips on wording, structure, or anything that helps avoid ambiguity. Using their name repeatedly gets clunky and it doesn’t completely solve the problem