Hello Krishna,
Welcome, and thanks for joining. I my opinion, regrettably, trying to find the cause of such noises without access to the car, is an almost impossible task, and you could get no end of ‘try this, try that’ -at expense - and still not arrive at the right diagnosis.
We could go through a process of asking you far more questions, but….
I think the ony sure and positive way forward is to get the car inspected and test driven at a either a trusted local independent, or local garage.
Did you renew the front and rear springs in an attempt to eliminate the noise?
Kind regards,
Gareth.