Phone screen acting very weird after water damage

About 2 and a half years ago my Samsung Galaxy J5 stopped working after i jumped in a pool with it (i know, not very smart). I found that the phone would turn on but the screen just didn’t work and i had accepted that this phone was a lost cause. However, about a year after the incident i found my old J5 and decided to test it out. When i put it on charge, i was suprised to see that the screen was functioning. Fast forward a couple of days, i wake up, try to check my phone and my phone screen is once again, not working. I recently found it again after looking for a temporary phone to use. It worked for about 8 days after not having touched it in 2 years, but then once again the screen stopped working.

In a nutshell: The longer my phone’s screen stays off, the longer the screen works. I find that it works for a couple of seconds if i wait a few hours, but thats it. I have googled far and wide but have never seen anyone that has had the same problem.

If anyone has a suggestion, please let me know because it’d be a shame to throw my phone out if it was fixable.

Many thanks.