Your paid subscription plan has been downgraded, yet your store exceeds the resource limits of the free basic plan.
Once your store is restricted, you will not be able to access Admin dashboard until you re-subscribe.
There are some reasons that makes your store restricted. Some quota restrictions are like:
Image quota over 20 files (upgrade to premium or more for unlimited images)
Store quota exceed more than 1 (upgrade to business to create multiple store)
Members quote exceed more than 1 (upgrade to business to invite more members)
How to recover my store?
Subscribe our paid subscription plan or contact support.