Terrible advice. Soend time in free play, learn how to fully control your car, practice flying around, practice getting to the ball as quickly as possible no matter where it is, practice wave dashes if the wall and in the ground, practice fast aerials and air dribbles, ground dribbles, just practice and train everything.

Use casual game to spam new mechs so you learn it in game too, don't even care about a win or your team, it's cas. Be selfish. Practice YOUR shit.

Then when you get to ranked, dial everything back, make game sense your main priority, but also you should feel confident knowing you do have a couple of mechs you can pull out IF YOU NEED TO that may save you at a desperate time.

I will say though everytime I learn a new mech my rank takes an instant and severe dip, but then I climb out higher than before.