Absolutely! You are always welcome to adjust your plan from the My Account page by clicking "Change Plan."
If you are currently on a monthly plan or 3-month plan, you will automatically be converted to a 1-quarter plan. If you are on a 6-month plan you will be converted to a 2-quarter plan. If you are on an annual (12-month) plan, you will be converted to an annual (4-quarter) plan. You can adjust this at any time on your My Account page.
We are currently still selling April boxes though, so this upgrade feature will not be available until May.