Google Sheets Conditional Formatting Overhaul

My Google Sheet spans about 100 individual pages packed with data, but the presentation is raw. I need the entire file to be reformatted exclusively through conditional formatting driven by custom formulas—no manual color fills or one-off tweaks... (Budget: €6 - €12 EUR, Jobs: Article Writing, Blog, Copy Editing, Copywriting, Data Management, Editing, Microsoft, PDF, Word, Writing)