I would start over with a new subscription. That connect the banking only import back to the first of the year.
Resolution for 'bank uploads issue: 'How do I get rid of old bank uploads and start fresh as of 1/1/2018?' available: Yes.
The bank uploads issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the bank uploads issue yourself by looking for a resolution described in the article. If it is a complex bank uploads issue or you are unable to solve the issue, you may contact us by clicking here or by using other bank uploads support options.
For more information about resolving issues related to bank uploads in Quickbooks/QBO or to get support for the issue 'How do I get rid of old bank uploads and start fresh as of 1/1/2018?', click the link below: