Dropped iphone 6 down the stairs and now there are weird black lines going through half the screen. Is there any way to fix it?

No cracks at all though.

Added (1). i already replaced my screen once too

Added (2). Also what is the price of all of this and should I just get a new phone?

Yes, get the screen replaced or the connection inside the phone, re-seated.
Either way the phone will need to be opened to see if the connector is loose, it will then be pulled off the connection and put back on to see if that solves the problem, if not, the screen will be replaced.

So either way, you will need to take it to an Apple store or a local cell phone repair shop, and NO there's nothing you can do with turning the phone off, resetting the phone, deleting apps, pushing certain buttons in certain combinations.

The digitiser is broken which is the actual screen behind the glass, you need a full screen replacement

If you've already replaced the screen, then if you are lucky it's just the connector ribbon that's bust. If it's not that, then it's the conector to the motherboard, and if it's not that then it's the motherboard itself! You really need to take your phone to be repaired to somewhere that knows what they are doing and can test it before they return it to you… And it's going to cost!

You should take that to an Apple Store to be repaired.

Lol, Give it to apple or some professional
in order to fix the "LCD"
or basically the thing that gives the screen color
the LCD is broken

Go to a place where their repair damaged merchandise and get it fixed there.

Yeah, get the screen replaced or the connection inside the phone, re-seated…
either way the phone shall need to be opened to see if the connector is loose, it shall then be pulled off the connection and put back on to see if that solves the problem, if not, the screen shall be replaced…

so either way, you shall need to take it to an apple store or a local cell phone repair shop, and no there's nothing you can do with turning the phone off, resetting the phone, deleting apps, pushing certain buttons in certain combinations…