Amazon. It looks like there is shrink wrap over the connector. Cut it off to see exactly what the connector looks like. You likely need something like this:
https://www.amazon.com/Connectors-Nelyeqwo-Solderless-Controller-Waterproof/dp/B07YFRT861/ref=sr\_1\_49?keywords=4+pin+led+connectors&qid=1672981933&sprefix=4+pin+led%2Caps%2C93&sr=8-49
You could solder it but simplest is with a coupler
https://www.amazon.com/dp/B07YFRT861/ref=sspa\_dk\_detail\_4