>>> " Your number of business files has exceeded the limit. "
You ordered an old Personal Plan over 10 years ago. We no longer offer this plan now. Now we offer a lot more storage space for the personal plans. However, we require these plans only be used for personal purposes. For business use, you need to order a business plan.
In your case, if you belive it is only for personal use, we recommend upgrading to our new peronal plan. For business use, please order a business basic plan. If you don't need any sub-users, we can offer you 1/3 off (Business Basic with 3 users). Keeping your current plan might be ok for now if your usage is very low.