steam room

Other than kicking yourself, allow it to continue to dry with gentle, room-temperature air; perhaps with a “fan assist.”

Placing it in a “Ziplock” along with some packaged/contained desiccant can’t do harm either.

DON’T use loose rice !

Also see this article:

If you see a liquid-detection alert on your iPhone - Apple Support

Turn it off immediately, then put it in a jar filled with silica gel for at least 24-48 hours.

If the issue persists, I suggest that you make an appointment (*) and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> https://locate.apple.com/choose-country-region . After checking it out, they'll give you all the available options.

Regards

Giulio

(*) You can do it:

• Online:--> Genius Bar Reservation and Apple Support Options - Apple;
• Contacting a local Apple Store or AASP among the list provided above;
• Using the "Apple Store" app, available and downloadable from AppStore.