Hardening a wordpress website

Job ID: 34352910

Budget: €30 – €250 EUR

No subdomains.
I cannot guarantee that it is in perfect order. It was hacked and I have had it repaired by Sucuri.
Currently they say it is showing errors linked to elementor-pro - which I don't use. See
- https://stackoverflow.com/questions/73276652/fatal-error-uncaught-reflectionexception-method-get-site-editor-type-does-not
elementor will probably fix it fairly soom.
Otherwise the site is fine.
I would like to make the site almost sealed, accepting inputs only from the owner.
It is a site publicising a book and has no need of inputs from third parties.
Related categories: PHP Web Security CSS HTML