This is exactly what I was thinking.If 10' more cord will do it, then a new charger with 24-25' of cable is likely the best option.
I bought this one, keeping in mind my Rivian charger is setup for 40amp (50amp breaker). It’s very well made (USA) and comes with a handy case.
https://intesettech.com/products/electric-vehicle-extension-cable-40-amp-made-in-usa
They also make a 48amp version.