KDP 8x10 Book Formatting

I have a completed 8” x 10” children’s book—interior in both .docx and .pdf, cover art in a separate file—that keeps getting rejected by Kindle Direct Publishing. I originally assembled everything in Adobe Acrobat, but the trim, bleed and image placement still don’t meet KDP’s specifications... (Budget: $30 - $250 USD, Jobs: Adobe Acrobat, Adobe InDesign, Brochure Design, eBooks, Graphic Design, PDF, Print Design, Publishing)