How to grow back hair pulled from glue-in weave.

Around 2013 I was a high school student who didn't know much about weaves, I just knew you could get it either sewed or glued in. Long story short my mother glued my weave in after I asked her to sew it in and my hair pulled out all through the middle a month later when I took it out. 4 years later and it has grown back in a few places but very sparsely. Is it possible to "fix" my hair? I'm only 21 and I have thinner hair than both my mother and grandmother which is embarrassing. 

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