You can change your subscription by going to the subscription center in settings and selecting your new tier.
For Mobile:
- After logging in to your account, tap the menu (avatar) in the upper left corner of the screen
- Tap "Settings"
- Tap "My Subscription"
- Choose the subscription tier and tap "Switch to this plan" under the applicable tier
For Web:
- After logging in to your account, click on the menu (avatar) in the upper right corner of the screen
- Click on "Profile & Settings"
- Click on "My Subscription"
- Choose the subscription tier, and click on "Switch to this plan" under the applicable tier