It was probably not a good idea to try turning it on/charging it before it had a chance to fully dry out. It's usually best to turn the device off completely until it has a chance to dry off before trying to use it again—this minimizes the chances of a short circuit damaging the components within.
That being said, you might still be able to open the phone and clean off any contacts on the motherboard that may have corroded to regain functionality. You'll want to follow our [guide|149716|Galaxy S21 Motherboard Replacement Guide|new_window=true] to remove the back case and access the motherboard. Then use 91% or higher isopropyl alcohol (99% is ideal) to clean off any corrosion you see. If that doesn't work, you'll likely have to start replacing components.
Check out this [[Samsung Galaxy S20 Will Not Turn On|Samsung Galaxy S20 Won't Turn On Troubleshooting Page|new_window=true]] for a list of things you can try to get your phone working again. It isn't an exact match for your phone but a lot of that information should still apply. Good luck with the repair!