Dear Debjani,
You can sign up for a Free 45 Day Trial of MoodleCloud and Restore the courses that you have created to the Trial Site.
You can sign up for our Free 45 Trial on our plan page here: https://moodle.com/moodlecloud/
You visit each individual course and click on Settings, then Backup to create the Backup.
You will need to go to your "Site Admin/Server Files" and find the automated backup there and download it to your computer.
Then go to your MoodleCloud Free Trial - go to Site Admin / Courses/ Restore Course to upload that file and Restore it.
You can learn more about backup and restore here:
https://docs.moodle.org/en/Backup
https://docs.moodle.org/en/Course_restore
I hope that helps.
Kelly