Okay, so this thread is a bit sleepy, but I thought I might offer some input anyway.
I’m a theater kid, so I say this not as someone who writes plays, but as someone who has spent a decent amount of time immersing myself in a play for a performance.
One thing I’ve noticed is that plays do not have a lot of emotional detail outside of the dialogue itself. Descriptions of how the setting looks are often more detailed than are a character’s inner thoughts and emotions. It likely sounds obvious, but is probably difficult in practice, that everything you as the writer want to say must be said through character dialogue.
The nuances of character emotion are more the job of the actors and director, rather than the playwright.
In a novel, you can say “Lily paused, struck by the implication of her own words.”
In a play, you can say, “Lily pauses”
In a novel, you can say, “Lily forced a smile, attempting politeness, while her palm twitched with the desire to strike him. She hoped Paul would make one more comment, would give her a reason to say ‘he went too far.’”
In a play, you can say, “Lily, visibly annoyed, smiles.”
Of course this isn’t a 100% of the time rule. But specificity like that in stage directions is considered improper.
All that to say: practice, practice, practice your dialogue.
