These are the tips to reinforce the security of your website:
Check your computer for viruses or infections.
2. Change the FTP username (use lowercase letters and numbers with at least 12 characters) and the FTP password (use at least 15 characters with a mix of uppercase and lowercase letters, numbers, and symbols).
2. If the server's safe mode is disabled, contact support to enable it.
3. If there are directories with 777 permissions, contact support and ask them to disable execution in these directories, indicating them in a list.
4. Check the PHP forms. http://www.profesionalhosting.com/soporte-en-linea/formulario-de-envio-seguro-antispam-preg181.html
5. Check the PHP files that upload files, making sure they don't allow uploading any type of file.
6. If you still have problems, contact support.