Contact customer service and ask for a repair. Nintendo got mass sued a couple years ago over the poor quality of the Joycons, and now has to repair drift for free even if the warranty period is up. I am not sure whether this applies to all parts of the world (I live n Germany), but I personally sent my Joycons to repair four times since buying the system (last one was in January) and always got a joke invoice for zero Euro from them. Only thing I had to actually pay for was postal service.

Even if they decline ....asking doesn't hurt and might be worth a shot.