Self-introspection is something you should do. Think of your relationship with yourself and others around you. May be questions like Who Am I? may also help. By the end of this lock down you will be a changed person. The way you handle people and talk to them will change.
You can watch the best movies you have missed all this time.
List down the names of people who are in your life till date. Making some genuine calls to a few people from that list every day and talk to them heartfully.
Now is the time to spend quality time with Kids, Parents and Pets at home. This should remain memorable forever.
If possible, grow some plants in your balcony. Water them and nurture them.
Help your family members in their activities. Learn some new skills.
Professionally, you can think of the changes you want to bring at your work place. You can plan your career and what it takes to reach your goals.
Life is all about Self, Society and Para. Think of how to better these aspects.