Optimize your database. Make sure your images are sized correctly BEFORE uploading, smushed/optimized.
Remove trashed items and change the page backups to 3. Then remove any extraneous backups.
Eliminate any old backups if you have any on cpanel.
Still running slow? Look at your plugins. Run a query plugin to detect excessive system resources.
Are you using plugins that duplicate some of the built-in speed enhancers that DIVI rolled out? Try turning off those plugins.
Are you running plugins that connect to other sources like Facebook, Instagram or google? Resource hogs and can slow the site down.