Wreckfest

At the very beginning of the game, it is better to farm up to level 10 using this method:

Track: any derby
Vehicle: school bus
Time: 2-4min
Opponents: 23
Opponent's car: sofa or lawnmower
Settings: hard difficulty, realistic damage, expert level opponents

In 2-4 minutes you can defeat 10-20 opponents, which will give you 10-20 thousand experience.

IMPORTANT! The school bus is not particularly agile, so as not to waste time on turns and turns, I advise you to respawn immediately after smashing your opponent into pieces.