People receive warnings for violating Fiverr’s terms of service.
These are the same terms of service that you will have agreed that you read when you signed-up to Fiverr.
If you haven’t read the TOS and you’ve received two warnings, then quite frankly it is your own fault.
It is common wisdom on the forums that on receiving a third warning you will be suspended permanently.
To help you, this is from the TOS:
Users may receive a warning to their account for violations of our Terms of Service and/or our Community Standards or any user misconduct reported to our Trust and Safety team. A warning will be sent to the user’s email address and will be displayed for such user on the Site. Warnings do not limit account activity, but can lead to your account losing Seller statuses or becoming permanently disabled based on the severity of the violation.