Try this too,

• Keep your Joomla Uptodate with its extensions.
• Keep regularly back of your site in clouds.
• Do not open robots.txt for secured folders.
• For latest Joomla version two-factor authentication will more secure.
• Make sure folders and files have right permission allowed.
• Use Cloudfare for Joomla.

Hope its helps..

Try this too,

• Keep your Joomla up-to-date together with its extensions.
• Keep regularly backups of your site in clouds.
• Do not open robots.txt for secured folders.
• For the latest Joomla versions, making use of the two-factor authentication will be more secure.
• Make sure folders and files have the right permissions allowed.
• Use Cloudfare for Joomla.

Hope its helps..