I'm having a bloody nightmare with my blog, https://www.thedetechtor.com, must be something to do with wix but it takes for ever to load, going to have to migrate to Wordpress
Well, part of it is probably the 355 requests it makes on a fresh load. Have you considered reducing the number of JavaScript libraries you use? You have quite a lot of them…
Wix is perfectly usable as long as you limit the number of components on the pages, especially if those components are not static which you clearly make a lot of use of.
Your usage and content has probably outgrown Wix unless you plan to simply the structure a bit.