Here's a link for purchase of a Dedicated IP from GoDaddy. It's a good thing to have, especially on shared hosting.
I would recommend steering away from Mailchimp personally. I'm not sure if you're paying for it but I use GoDaddy Email Marketing and it doesn't slow down my site because there's nothing to install and it's much easier to use and integrate.
I am a GoDaddy End User - Just Like You * Please note that I DO NOT answer private messages. Please ask your question in the proper forum so the answer can assist EVERYONE in the community and not just you. If you contact me via PM for help, I will give you a price quote for my personal services. Thanks! *
Once your issue is resolved, please be sure to come back and click accept for the solution