If you're hosting with GoDaddy, I would highly recommend switching to pretty much any other provider on the planet other than 1and1. GoDaddy is notorious for screwing over users for basically as long as they've been around.

I'm not specifically sure about GoDaddy, but this Quora answer suggests that even the best plans can't handle more than 5,000-7,000 visitors per day: https://www.quora.com/How-much-website-traffic-a-sharing-hos...