The language you quote would not let you cancel at any time on 30 days notice; rather, it allows to you avoid the automatic one-year-at-time renewal of the contact by providing 30 days (at least; you can provide more) notice prior to the current term expiring. For example, if the current term of the contract expires, say, on September 29, 2019, you would provide notice no later than 8/29/19 that you will not review it; if you fail to do so, the contract will autorenew until 9/29/20. But can't, based on what you write, end the contract early; all you can do is avoid renewing it for another year.