In reply to Maritza Diaz.

There was, probably still is, a Divi Builder plugin. This plugin deals with (i.e. parses) the shortcodes used by the Divi theme so that you can more easily switch themes.

The plugin is/was available from Elegant Themes. It might be called something different to Divi Builder but you will recognise it when you see it. This plugin will enable you to change your theme without losing too much of the content layout though there will be differences and you will need to go through your content to remove the Divi shortcodes, which, with the Divi Builder plugin installed, you ought now to be able to do leisurely.

If that doesn't work for you.. you will need to do the work the long way.