Most likely after the domain expired, it was registered by someone else.
Please note that we do not offer domain brokering services, so we are not able to forward your request to the registrant.
If you still believe that you have a priority right to own this domain-name, we kindly ask you to initiate a UDRP Process via WIPO.
If you are referring to a non gTLD (but to a ccTLD), you may get in contact with the corresponding registry to seek for a dispute resolution process.