If your client wants a carousel, there’s a great opportunity they don’t precisely know what the one thing they need people to understand is. So work along with your client to narrow in on a single message, based on your mutual working out of the target viewers, and indicate they focus on that message. Remind them that a visitor to your web content have to be able to right this moment comprehend what your company does, and that a slider perhaps won’t help that. If there are secondary/tertiary messages they want to share, indicate that they cover these similarly down the homepage, in preference to in a carousel.
These days, people scroll.