Big scratch on my Mitsubishi please help

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Hey guys,

Late the other night I had a very rude awakening by my car alarm going off so as most people would do i looked out the window, seen nothing went downstairs turned the alarm off and seen no one in site (thinking maybe a glitch or a cat or something).The next day i get up as usual go to work as normal park the Mitsubishi 3000gt up and did what i had to do in work. When finishing i exited the building and it must have been one of the worst days of my life there is a 3 foot key scratch down the passenger side of my Mitsubishi… furious!! if i catch the mother****** who did this, well….

Anyway now my rant is over I have to fix this problem at the minute I am using a black marker pen to hide the scratch the best I can, but I know it is there and it is driving me crazy. I am here for your guidance and help I have been out and brought a car polisher for sale/waxing kit for sale at the local auto store and some metallic T-CUT. So now the process of how to clean the Mitsubishi, wax and blend he scratch in, I’m a little lost i might even need more products for the Mitsubishi but I have no idea..
Any advice/information will be mu appreciated, I will give anything a go that you throw my way before I have to take her in for a re-spray which I’m not looking forward to.

SPECS
Year: 1999
Color: Metallic Black

If there is any other information needed just let me know and I will add it on!!!

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Thanks guys