I loved improv; I was known as a supporting player who would, upon occasion, say the funniest thing ever "Jellybean CPR!" comes to mind.
I also acted.
Acting improved my expressions and speech; the teachers, coaches, and directors were just like my therapists in that regard, and they are used to correcting NTs precisely, so anyone can benefit. Improv did neither much, but it felt more like fun. It's okay to be unexpected and laughed at in improv, which helped my esteem more.
In the end, the only acting that I excelled at was Shakespeare, where nuance was less important than grasp of the material. I was also told my cadence was perfect, which surprised me, but makes sense in a way, as the words themselves become like clothes.
And I doubt that makes sense to others, so I apologize.