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Wix USED to be bad for SEO until around 5 years ago. They engaged some pretty big brain people to fix it and it’s absolutely on par with other CMS’s now.
DO NOT move to WordPress, it’s a pain to maintain and extremely insecure unless your agency is doing constant updates to core, themes, & plugins, and many of them don’t do this. It’s about the same difficulty level for you to update your regular content in terms of how easy it is, but if Wix is working for you there’s no reason to switch.
Follow Wix’s own SEO guides if you have time internally, if not any SEO freelancer or agency can do it for you. Starting off with an entirely new site build as point of entry for an agency is ludicrous unless yours is broken beyond repair, and it doesn’t sound like it is.
