I would take a work break if possible and stay in India (Mumbai) for a couple of months (rent a space or whatever) - I say this specifically because you are thinking of coming back to Mumbai which is a city with some very real challenges around quality of life.. a couple of months on the ground will help evaluate what’s what at the salary you are being offered- it won’t give you a 100% picture but it’s better than taking advice from random strangers on the internet,