Yowamushi Pedal, Prince of Stride: Alternative Recommendations
Both anime are sports oriented with a protagonist demonstrating unpredictable and outstanding results that surprises everyone. Also builds up to competing and winning competitions with a variety of characters as well as 1-2 people being the more experienced and supportive friend of the protagonist.
Both anime about sport, the main character wasn't interested in this their sports, but after trying it out they fell in love with it.
*Main characters wants to improve to help their team
*Both anime includes their motivation to improve