Hello good morning, I want to change domain

Hello good morning, I want to change domain, I have suimportacion.com, but that domain will no longer be used, I will change it to siofertas.com, it is easier to search and use, I want you to help me change that domain for siofertas. com I am not going to continue using suimportacion.com there is a way that I can change domain or you can help me, thank you very much, I already disable suimportacion.com and remove it from the event but I could not activate it. Thank you very much for your help.