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Hi guys I have an iPhone 6s Plus lcd screen which I replaced and during the replacement I somehow damaged the components on the long flex cable attached with the lcd so now when I connect the home button to the connector the button doesn’t work but the home button is absolutely fine with other lcds so I was wondering would I be able to buy just a long flex cable attached with lcd or do I have to buy a new lcd ?

With that particular model, it is very common to damage the little cable built into the LCD, you will need to replace the entire LCD in order to fix the cable issue as the cable is built onto the backlight of the LCD and is extremely hard to replace individually.