17m i want my hair back:(

So I have recovered from stage 4 hodgkins lymphoma and have been off treatment for about 9 months now, before my treatment i had very thick and full hair, with a good hair line. However once my hair grew back from after my treatment I was really disappointed to realize my hair line is pretty far back now(although it's not consistently recesseding, it's just far back) and it's uneven. My hair is also very thin now and pretty sparse so you can see my scalp through my hair. I really want my hair back to what it used to be, can anyone give me anf solution or help with this:(

Another side note o didn't ask my doctor about this and he kinda shrugged it off and said" yeah your hair grows back different after chemo"