My phone won't turn on properly.

A few weeks ago I accidentally dropped my phone in the toilet. I took it out and I dried it and then I put it in rice. Then the next day I was able to turn on my phone. But it took a while to turn on. Ever since that day my phone would take at least 10 minutes to turn on properly meaning it would show the connection battery bar but it would stay like that for a while and then it'll show that intro that Samsung has when you turn on your phone and it takes a while to finally start showing my home screen and all the apps that I have. Today for some reason when I put the charger on my phone it'll show the connection battery bar and then the screen goes all black then it goes back to the connection battery bar then it goes all black again and thats been going on for almost the whole day now. So I decided to take the battery out and just wait for a while then I put it back in and it still keeps doing the same thing it shows that its charging but it doesn't want to turn on fully it doesn't show my home screen nor the apps nor my lock screen it just goes to the battery bar then it goes all black then it goes to the battery bar then it goes all black. That happens only when I charge my phone but when I take off the charger my phone doesn't turn on at all. I have hold on the buttons on my phone to see if it'll turn on but it doesn't work at all. Can anyone please tell me how to fix that??