Mario Kart in Brawl Stars

Firstly, Bolt is good in Brawl Ball and Brawl Arena. But this guide is for Brawl Ball. The Brawl Arena guide will be linked once finished.
I suggest you play with teammates. If you don’t have any friends online, then you can use the join team button. I think it's a very underrated feature.
Anyways, you need one defensive brawler like Cordelius or Otis (in this meta Otis is better) and maybe a Chester or a Pierce or any brawler with high burst damage (HM to Mina, Colette and Colt).
Try to play defensive until you have your super. You can farm your super by rolling around the map. Also, don’t forget to keep pressing attack if you lose speed. If there's a brawler with 5000 HP or less in your way, don't hesitate to roll into them, then turn and roll into them again unless you're facing someone like Chester or Otis.
Now once you have your super, gadget and super and immediately pick up the ball. It's a free walk-in because thanks to the starpower, you can’t get slowed, stunned, knockbacked, muted or thrown into the air by something like a Mina super or Gale gadget. The only thing that stops you is high damge brawlers, which is why the extra HP from your gadget is important.
I hope this helped.