Your case is EB1 (extraordinary ability) and self sponsored petition, if that was self sponsored you don’t have to use AC21, you have only to work in your Extra ability area that is the only requirement for you. find new job in your field that is enough, I dont know if it is EB1-1 or EB1-2 or EB1-3, if it is EB1-1 you are free to join any employer in your field