H1b visa interview slot in mumbai

currently, I see 30th Spt, that means all before 30th are taken or still, some slots will open up. I am desperately hoping to get a slot before 8-10th Spt, Is there any chance?

Well, they may open up, you need to keep checking once or twice a day…You can go for other locations, if urgent. You can call the customer service and seek their advice.