Malware Cleanup of WordPress Sites Hosted by HostGator

Seeking malware removal from five Wordpress sites hosted by Hostgator: One primary domain and four subdomains. Beside that, eight unused sites need be deleted. (I tried deleting the directories myself, but a persistent malware script or backdoor on the hosting account keeps regenerating and replacing these folders the next day.) Please trace the root source of this infection, delete these unused directories, and ensure they cannot self-replicate. I am a non-tech person and am not completely sure whether all five sites are built on WordPress, or if they all use the Divi theme. Because of this, the malware may have corrupted other unknown themes on the server. I do have a clean, zipped version of the Divi theme ready to share if it helps for the sites that use it. Please audit the themes on the other sites and let me know what you find. Note: A couple of the domains deal with intimacy coaching and relationship topics. The titles contain words that some conservative environments might flag. Will this pose any firewall issues or personal discomfort for you while working in the cPanel/databases? Budget is set to $150 as a starting point, but I am willing to go higher for a top-tier security specialist who can offer a 30-day warranty against re-infection.