How do I fix the black spot and lines on my iPhone screen?

I saw that the screen on my iPhone 6s was coming up so I pushed it down. However, it created a huge black spot that looks like ink and there are now many colorful lines on the screen. The screen has also stopped working; if I try to tap anything it doesn't respond. Every time I turn on my phone its disabled for 15 minutes and I also can't unlock it because of the broken screen. I don't think there are any cracks in my phone except my screen protector. Is there any way I can fix the phone myself and if its possible what part of the phone is broken and where can I buy the new parts. Or do I have no hope and should just get s new one? Thanks.

Added (1). By fix I mean more like repair or replace the screen.

Why people born from 1996 and later claim that they are core 2000s kid when they can't anything before 2007?

As someone born in 1969, I don't get it.These children who were born from 1996-1999 and later believe that they are core 2000s kids when the reality they can't even remember things before 2007, which would make them 2000/2010 hybrids. I believe that people born in 1994/1995 are true or core 2000s kids because they actually remember most of the decade, not just 1,2, or 4 years of the decade.People born from 1996 and later are 2000s and 2010s hybrids. Heck, Some articles even mention that people born in 1996 and later can't even remember a time before the iphones came in 2007.

https://www.nytimes.com/...ion-z.html
https://www.businessinsider.com/gen-zs-habits-different-from-millennials-2018-6
http://www.keepitusable.com/blog/xennials-the-new-micro-generation-and-what-you-need-to-know/

How to fix iphone 6 plus?

I was with my friends and when i went to sit down on the toilet my phone fell out into the water. I quickly grabbed it, turned it off and shook off as much water as i could and i then went out and out it under the dryer. For the last 3-4 hours i had it in the sun so the water would evaporate and the screen can now be turned on but is constantly changing colors, only lines run across screen, screen doesn't respond to my touch. I have now put it in rice. I'm extremely worried because this was my mum s warranty phone meaning i can't get another and i've only had it for about 4-5 months after losing my other phone. WHAT DO I DO?