The paranoia is what's really getting to your head here 😅 There's no magical connection between your phone getting wet and bad things happening afterward. Your Samsung got wet, you dried it out and it works again - that's just pure luck that you got it out of the water quickly, not a sign of disaster to come. The mind is weird and when something "weird" happens, we tend to look for patterns where there aren't any, so now pretty much anything even slightly bad that happens to you is probably something you're mentally linking to that river incident.
What does happen is once we slip into that paranoid mode, anxiety works against us. You start noticing more negative things (confirmation bias) and that reinforces the belief that something bad is coming. So the "bad effect" here doesn't come from the wet phone, it comes from your own head spinning on the issue. My advice: acknowledge it was an accident, celebrate that your phone still works (that was REAL luck), and stop trying to find some deeper meaning in the paranoia. If something bad happened tomorrow, it'd be pure coincidence, not a consequence of what happened a while back at the beach 🌊