You do not need to upgrade your contracted power
It is everyone’s first question and the answer is almost always no. A domestic charger can manage its consumption according to what the rest of the house is using: if the oven and the hob go on, the charger backs off; when they go off, it picks up. The car is plugged in all night, so it does not need to charge at full power the whole time, only to be full by morning.
Upgrading your power means paying a higher standing charge every month of the year for consumption that happens in the small hours. It almost never pays.