Depending on your location, you can typically take it in to a general electronics repair shop, or you can sometimes ship it to a shop. A quick google search gives you the best of both worlds. Of course I would need to know what county you reside in, like @hellomacos mentions
Of course I do want to mention that a Xbox series S Out-Of-Warranty repair is 199.00 USD from Microsoft themselves so if you're getting a quote from an independent repair shop, keep that price in mind.
As far as water damage goes, the best thing you can do for now, is to not plug in the Xbox, and let it dry. If you have an airtight container and silica gel packets, place the packets and Xbox in the container, wait a few days, and then I would try starting the Xbox