Contact the registrar of your domain name. Let them know that it has expired, but you want to get it back. Once domain names expire, they are basically put on hold for 60 days. No one can purchase the domain name, but you can bring the domain name out of this hold status. Usually your registrar will charge you a fee to make the domain name available again. Once you pay the fee and renew the domain name you will again have control of the domain name.
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