I don't know what happened with your account specifically as you haven't mentioned your username. You can always drop us a support request regarding your account here:
Actually, with metric units it's pretty easy: 1,000 liters of water are needed to fill a cubic meter of space. That's because in the metric system 1 cubic centimeter is equivalent to 1 milliliter.
https://about.gitlab.com/support/#dormant-namespace-requests
If your account was released under this policy, it's likely your username was renamed to <username>_idle, as documented here:
https://about.gitlab.com/handbook/support/workflows/dormant_...
I don't know what happened with your account specifically as you haven't mentioned your username. You can always drop us a support request regarding your account here:
https://support.gitlab.com/hc/en-us