@sudhersunS  can you confirm that you have gone through the Pega Academy FAQ questions?

See the following:

Other frequently asked questions

• I reset my Pega instance. Can I get my work back?
• My work is gone!

Each Challenge and Mission Exercise uses a separate cloud environment.

You may have only two active systems per mission. If you initiate a third environment in the same mission, your oldest environment will be terminated.

The expiration guidelines for Pega instances are:

Challenges

• Inactive Challenge environments will be terminated after 2 days
• All Challenge environments will be terminated after 7 days (regardless of your activity)

Mission Exercises

• All Mission Exercise environments will be terminated after 7 days (regardless of your activity)

There is also a link where you can contact the Academy team directly.