You may be encountering a problem with file size and/or other data on your account, rather than the record limit.
How much storage space do I get?
Subscriptions provide flexible storage capacity options for your organization.
If you have an organizational account, check with your
administrator for information about your storage limit. If you are an
administrator, you can view detailed reports about your organization's
storage of tiles, features, and files. A public account comes with 2
GB of total storage space.
Also note:
Organizational and public accounts can upload items through My Content that are up to 1 GB in size. This is a browser limit; larger file sizes may be supported when uploading through desktop applications such as ArcGIS for Desktop.