Desperate need of help - Face ID stopped working on blockchain wallet app and I don't remember password
Most of the issues you're encountering are limited to the proprietary processes used by the blockchain app you are using, and only their support will be able to navigate you through them. Concepts such as face ID, wallet ID, etc. are not standardized by the bitcoin implementations, and vary from provider to provider. 

If you're lucky, when Face ID is disabled, whatever scheme they used to decrypt the wallet via Face ID is not deleted, and may be recoverable with someone from the company helping you. However, a well designed wallet would likely remove any secret used to grant access via secondary authentication such as Face ID if the authentication's validity was in question, and fallback to a password based decryption instead.

From a general bitcoin perspective, without the backup seed words, you essentially have no bitcoin, unless you are able to get someone who knows the app's processes to help you recover any information that may remain. Even after that, it is highly likely that the information is encrypted in a manner which prevents anyone from accessing it without the password.