Nothing really. Your account remains intact and you are in complete control which means you can deactivate or delete it anytime you feel you no longer need it. We only recommend that you indicate on your profile that you are now working with your dream brand. This will tell us to stop showcasing you to talent hunters/employers untill you reactivate your profile.
As a professional, we hope you won't need a new job (entertainers like actors will likely be in need of new roles in fresh projects as time goes on) but we suggest you follow the brands you love and maintain your account as you will have the opportunity to stay updated on the hottest new talents and discover new amazing teams or groups that will make a huge impact in the society.