Is there any project idea so that i can upskill my devops skills?

You don’t upskill a skill, you upskill yourself.

Ever thought of writing a linux Kernel Module?

@Ranchonyx kinda ...extreme?! XD

Well.... DevOps is a vast field.

Try to build a working isolated environment consisting of e.g. an email server, ansible, an application, an database server.

All rootless with proper permissions, documented setup, logging.

Have fun.

;)

Isolated - ensure in whatever way that only the parts of the environment can talk with each other, but not the outside.