Fix 5 wordpress site errors

site affected is https://craftedhandrails.co.uk/

the hosting company IONOS have very bad.

There was a debugging error that they tried to fix but made website worse.

the issues that need fixing are as follows:

1)
Warning: array_key_exists() expects parameter 2 to be array, null given in /homepages/38/d33135508/htdocs/craftedhandrailsWPsite/Handrails2/wp-content/themes/Divi/includes/builder/class-et-builder-element.php on line 782

2) Yoast Seo local plugin is causing a debugging issue so needs to be removed, you can't deactivate it so need to remove it from .

3) the SSL security padlock has disappeared

4) the home page slider has disappeared

5) the footer and some icons are missing.

the site was ok 48 hours ago, there is a backup section in The host is .ionos.co.uk but not sure how to fix it.