Hello,
I notice that you have an account that has an old, discontinued plan. I can upgrade you to our new plan which has unlimited diskspace, there's however a couple draw backs compared to the plan you are on right now.
With the new unlimited plan you would only get a max of 2 addon domains (you currently have a max of 3) same goes for sub domains, you would only be allowed one parked domain (compared to the current 3 you have). Number of email accounts you can create would also decrease, to being 3 maximum. You would also only be allowed 2 databases (whereas your current plan allows 3).
By looking at the current usage you have on the account, the new plan would not cause a problem since you are within those limits currently on all parts, but you'd end up maxing a couple options with the new plan.
Do you want us to proceed with changing to the new plan that gives unlimited storage, but decreases a few other limits on the account?