- Tap the profile icon.
- Tap Subscriptions or Manage subscriptions
- Tap Restore Purchases.
Hope you are doing well.
As mentioned that you are not able to use the premium features. Try to sign out and sign in back to your account. Do the following to restore your subscription:
For more help refer to: https://helpx.adobe.com/acrobat/mobile-app-faq.html
Let us know how it works.