I got water in my phone and it blocked my front camera and that’s why my Face ID stopped working

Visit an Apple Store or an Apple Authorized Reseller in your region for assistance to diagnose the problem.

And they could offer a possible solution.

You will first have to make an appointment due to the pandemic.

See: Contact Apple for support and service

Contact Apple for support and service - Apple Support

It makes sense to make an appointment to avoid waiting since there may be limited support opening at a Genius Bar, but I don't think the pandemic policy of having to make an appointment for anything in an Apple Store is still in effect.

Go to this page to find your nearest Apple Authorized Service Provider (AASP) or Apple Authorized Distributor (AAD) --> Find Locations

How to make a Genius Bar appointment

1. Go to Genius Bar Reservation and Apple Support Options - Apple

2. Go to "Get hardware help".

3. Select your hardware and continue selecting options requiring replacing parts until you see "Bring in for Repair"

4. Sign in with your Apple ID