If your domain name has expired, you may still be able to renew it and regain control of it. The exact steps you need to take will depend on how long ago your domain name expired and what stage it is in.
If your domain name has only recently expired, it may still be in the grace period, during which you can renew it without incurring additional fees. In this case, you can contact the company you registered your domain name with and ask them to renew it for you. They will typically be able to do this quickly and easily.
If your domain name has been expired for longer, it may be in the redemption period. During this time, you can still renew your domain name, but you may have to pay a higher fee to do so. You will need to contact the company you registered your domain name with and ask them to renew it for you. They will typically provide instructions on how to do this and how much it will cost.
If your domain name has been expired for an extended period of time, it may have entered the pending delete stage. In this case, it may not be possible to renew your domain name and you may need to let it go. You can contact the company you registered your domain name with to inquire about the availability of the domain name and to discuss your options.
Overall, if your domain name has expired, it's important to act quickly to try to renew it before it becomes unavailable. You can contact the company you registered your domain name with for assistance.