Hi, sorry to hear about the hassle. If you’re using a premium theme, you could consider reaching out to the author’s for a hand, support is usually a big part of the premium offering.
You’d need to look for a working baseline. If you activate a default theme like Twenty Seventeen and Page Builder by SiteOrgin and deactivate all other plugins, does your site and Page Builder work? If so, you’ve found a working baseline. If you activate your premium theme, does an issue occur? If not, start activating your plugins one by one to see when the issue occurs.
If the problem doesn’t resolve with all plugins except Page Builder deactivated and a default theme like Twenty Seventeen activated then you’ve failed to find a working basline.
Let us know how it goes 🙂