Ethan, phishing websites attempt to deceive you into divulging personal information. Since you did not do that, then you don't need to do anything.
I cleared all my cookie data ...
Good. That's the only justifiable action to take in an abundance of caution.
... what should I do as im fairly sure my Iphone has been infected by malware
It has not been infected with anything.
Phishing sites are common. Just don't fall victim to them by explicitly providing any personal information such as your Apple ID, bank account or credit card numbers... that sort of thing. Phishing themselves cannot extract that information from your iPhone.
Read Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support
