He may take the undue credit of being successful in controlling COVID-19. But, actually it was because of the mercy of Allah almighty. Truth is that it was getting out of control after Eidul Fitar and 1.2 millions cases were projected by August. Than suddenly things turned around. Everyone knows that there is no cure medicine no vaccine for this disease, except social distancing which was far from adhere to.
The actual reason, I think that he has been able to recover part of his image is that he is no longer acting as an opposition leader who is obsessed with NS. Instead now he has started acting like a PM, one who is working to solve the problems this country is facing.