How to effectively structure the literature review chapter in a 400-page dissertation template before the April 15th deadline without breaking the bank?

I'm a 4th-year PhD candidate in Materials Science, and I'm struggling to organize my literature review chapter, which accounts for nearly 50 pages of my dissertation. I've been trying to use existing templates online, but none of them seem to fit my specific needs. I've also read multiple books on academic writing, but I'm still unsure how to balance the depth of analysis with the need for concision. I have a limited budget of $500 for a professional editor to review my work, so I need to make the most of the existing resources and decide on a clear structure for this chapter.