I have modified and the conflict is no more coming however, the issue is not resolved yet.
https://www.radiantautopart.com/rfq/ ( please open it in incognito )
I tried fixing the issue by what is mentioned in the stack overflow link
What I have done
Rename the contact form 7 plugin to cf7
Rename drag-and-drop-multiple-file-upload-contact-form-7 to drag-and-drop-multiple-file-upload
Rename contact-form-cfdb7 to cfdb7
At this point the conflict was reduced to only Css and Js file. So I have added
define( ‘WPCF7_LOAD_CSS’, false );
define( ‘WPCF7_LOAD_JS’, false );
in wp-config.php and uploaded the js and css file in the theme folder and called from the header.php file.
Now there is no conflict is showing in the console panel. But the issue is not solved.