I have a couple of different LED decoration lights with this kind of power connector there the cable has been damaged or ripped off.

This is a simple replacement connector housing that is easy to print and works quite well.

This is how I have done it:

• Print the connector in TPU
• 1,5mm wire ferrules worked well for me as contact pins. Make sure to keep the top part round. (I soldered them.)
• Fill the connector with silicone or similar to keep it a little flexible and make it more weather resistant.