I am over my storage limit. If I delete some items right away, will I be able to add more?

You didn't answer my question. 

I see that someone just upgraded our account, but if we had deleted some MB first, would that have given us more storage?

Since today is 1st of the month all your limits are reset, so your account is in good standings:

If you have any additional questions please let us know, we'll be glad to help!

Thank you!