Sounds like you're searching for a minimum of two editors, then. Maybe even three or four - depending on your financial resources.
If you're a relatively new author like me, I'd suggest to join several FB groups for writers/authors first (feel free to check the ones I've joined on FB as a start). This is so you'd gain some knowledge about the different types of editors, the pricetags for their services, set your expectations, ask the audience to share their experience as well as what to watch out for ... even chat with some of the editors (especially if you decide to make a post of your own).
I know I've gained a lot of knowledge by reading through numerous posts (and posting some of mine). You can, of course google everything as well, but I find it so much more useful when I can directly ask some questions and have them answered in a snap by a number of people who went through the whole ordeal already.
I'm not familiar with Fiiver (maybe it offers all that as well - then it's cool).
Anyways, good luck, and I hope you manage to find a good editor(s) that suits your needs.