100% Email quota message

Hi

I have been getting this message on and off for awhile. I delete emails but the lowest I can can my percentage down to is 95%. I have cleared out all of the folders I had setup so that they are pretty much empty which is upsetting because they were messages that I wanted to keep which is why I went to the trouble of setting up folders and moved messages to them.

I empty my trash folder regularly and I do not have large attachment files. I am constantly deleting messages that I really don’t want to delete but I get desperate so I wind up deleting them. 

Can I archive emails somewhere that I can still have access to them but clear space so I don’t get the messages and have to jump through hoops every 2-3 months?  

Can I pay for more storage space?  I don’t want to use another email address because it would be too much confusion for my business.  I have had an aol account for more than 20 years and never had this issue and I can access emails from the beginning of that account 20+ years ago and never had a “quota” issue. I prefer the Xfinity email service which is why I am desperately trying to hold onto this email account. 

Any help is be greatly appreciated. 

Thanks

Cindy