Iphone 11 restarting in every 2-3 minutes.

the caacity showing 77% and still giving backup for 8-10 hours.

If this were really true, the phone would not be restarting every 2-3 minutes.

I want to understand the exact problem with my iphone and what will be the correct solution to resolve the issue.

Make an appointment at the Apple Store or take the phone to an authorized Apple Service shop so can run some tests and advise you on your options.

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The phone display damaged earlier same had been replaced

Hopefully, service was performed by an authorized shop. If not, Apple is going to refuse to even look at the phone.

The phone's battery capacity should have dropped by 6-10% over a years time. The 77% figure is likely not a correct reading.

You need to have special software and special training to be able to interpret the data in Analytics. No one here can help with that.

Please take the phone in for service. You will not be able to repair it yourself.

Who replaced the display? If it was a third party repair shop, they may have caused damage to the phone.

If the display was replaced by a third party shop, Apple will no longer work on your phone.