for example thought of kufr like am i following the correct religion what if there is no god and i am doing all this namaz and all please tell me some dua to stop such doubts

Your answer wont lie in just saying supplications but also you need to study beliefs and firmly ground yourself in knowledge. Knowledge removes doubts and establishes certainty.

I have a course on beliefs if you can download the app Telegram and follow this link

https://t.me/ShiaBeliefs

I can also recommend some books if you like