QB Issue Resolution:

“you may delete some of your inactive customers/ those customers that do not belong in the company anymore.”

You cannot Delete names that have be used in transactions. If you monitor that info, using F2, bottom right, prior to Hitting the lock, you can Merge old customer names into one generic name of Old Customers, to reduce the Count.

Resolution for Issue 'I cannot add any new customers? 14500.00 is the limit? what can I do?' available: Yes (Solved).
Source: Intuit Community forum.

I cannot add any new customers? 14500.00 is the limit? what can I do?: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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