Big Sur App Store not working properly

Hello ShreyansPoddar,

Welcome to Apple Support Communities! We understand you're having trouble downloading and updating apps from the App Store. We're happy to assist you with this.

Let's start by quitting all of your apps and restart the Mac. Make sure "Reopen apps at login is unchecked". This is a simple step that can help resolve many issues.

Quit apps on Mac - Apple Support

How to turn your Mac on or off - Apple Support

Try to update or download an app to see if the issue is resolved. If not, test the issue in safe mode to see if the same thing happens. This can help eliminate any third party software that may be causing complications: How to use safe mode on your Mac - Apple Support

If the issue persists, let's test in a new user account to see if this is something that only occurs in your user account: Set up users, guests, and groups on Mac - Apple Support

Best Regards.

Hello again ShreyansPoddar,

Thanks for the update. We're glad your issue is resolved and thanks for using the Apple Support Communities!

Have a great day.