Safari quit unexpectedly on my mac and is not opening.

Are you running any anti - virus programs? Using a VPN?

Try setting up another admin user account in System Preferences/Users & Groups to see if the same problem continues. Please post back on whether or not this worked. Also try the Safe Mode. Please post back on whether or not this worked.

Isolating an issue by using another user account    

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Greetings aishwariya129,

Thanks for your reply! We see from the steps you've completed that Safari is continuing to experience close unexpectedly. We recommend the following, progressive steps:

1. Restart the Mac from the  Menu > Restart.
2. Press Shift while clicking on Safari from the Dock to relaunch the app. This removes the prior application state, and launches Safari with a fresh session.
3. If the issue persists, boot into macOS Recovery as explained here: About macOS Recovery.
4. Open Disk Utility and run First Aid, as explained here: How to repair a Mac disk with Disk Utility. Kindly refer to this detailed guide for further tips: Repair a storage device in Disk Utility on Mac.
5. If any issues are found, follow the steps in the linked guides above to repair the issue.
6. Should the disk need to be repaired, the repair complete successfully, and the issue continue, then open this link to learn How to reinstall macOS from macOS Recovery.

We trust these steps will resolve the issue.

Keep us posted.

Hello aishwariya129,

We want you to be able to get back to surfing the web with Safari, so let's see what might be happening there.

Safe mode was a good step to help isolate.

Restart your Mac, then hold down the Shift key while opening Safari, this doesn't change the setting, but Safari forgets any windows that were open the last time you quit the app. Then follow the steps in this resource: If Safari is slow, stops responding, quits unexpectedly, or has other issues

See if that does the trick.