Keratin Brazilian Treatment Problems

Back in October I got the Keratin Complex Hair Treatment and it worked very well but faded, as it was supposed to, after 4ish months. So about 2 weeks ago I redid it and this time my hair is much much thinner and straighter. I knew it compiled on the hair but now my hair feels and looks thin and falls completely flat! I have bangs and it looks terrible! Is there a way to wear down the treatment fast? Or anything I can do to restore volume and texture to my hair?! Thanks in advance.