Haikyuu!!, Ahiru no Sora Recommendations
Lead protagonist is very similar to Haikyuu's lead. Both small and wants to demonstrate some athletic skills to be acknowledged, and grows from the tough opponents they face.
Both main characters are small for their sport and have to deal with adversity along the way.
A weak character brings the club alive in both the anime and aims high.
Though Karasuno Volley Ball is already in spirits in contrast with the school here.