There are also wonderful voice academies and studios that teach voice acting, such as Global Voice Actors Academy (GVAA), Edge Studio, and several more. Voice acting classes can also be found at some colleges (you will have to look up your local college to find out). There are also workshops and meet-up groups available that can be found online. It takes some digging, but there is plenty of opportunity if you are willing to put the work in.
Another option is Audiobook Creation Exchange (ACX). ACX is an audiobook narrator and author exchange. It is a part of Audible, which is a part of Amazon, and is free for both the author and the narrator. There are a few things that need to be known before joining, but that is a whole other topic.