Once you enter a new tier, you'll be in that tier for 12 months. If after 12 months you don’t earn points to retain your tier, you will be downgraded to the tier that matches your points earned within the last 12 months. For example, if you entered a new tier on September 1st, 2021, you will retain that tier until September 1st, 2022, but will be downgraded if you have not earned any more points within the 12 months.