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Hello I got a kindle fire hd like 8 years ago and i have rooted it, it got bricked (kindle requires fast boot cable to be fixed) i tried making one using my crappy soldering skills it was recognized for a bit so i manipulated the wires witg my finger it worked as i kept my finger on the wires but later it didn’t i don’t know what is the problem now and by all means im not an expert can u help me

I suggest you practice your soldering skills until you can make a good job of it. There are plenty of online videos and tutorials to help you and there are kits out there on which to practice. Also get yourself a cheap multimeter so you can test for contunuity and short circuits. You don’t need a fancy one, but if it has a beeper to indicate continuity that helps. There are also plenty of tutorials to learn how to use a multimeter, e.g. https://wiki.restarters.net/How_to_use_a