 If you liked
Slow Start
|
 ...then you might like
Hitoribocchi no Marumaru Seikatsu
|
Both series focus on shy, kind-hearted characters starting a new part of their school life (middle/junior high in Bocchi, high school in Slow Start) and learning to improve their social abilities as they make all sorts of new friends.
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Recommended by RiverSorcerer
Both have that character plot where introverted girl move to the next level of her educational attainment, but has some problems adapting until thing things went fine for the said characters.
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Recommended by JiangHaoyi1979