Hi @BruhMoment Stadia is a cloud based gaming environment so it's not possible to lose access to the games you've purchased or claimed through Pro subscription (as long you stay subscribed) unless you delete your Stadia / Google account.
Did you delete your Stadia app? If that's the case you can re download the app and sign in using the account you used for Stadia, and you'll be able to access the games you already have access to.
If you meant something else, please elaborate more so we can try to help you more.
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Stadia Guides are not employed by Google. Opinions are my own.
