Google Sheet Functionality Fix

I need an experienced Google Sheets expert to review and fix a complex spreadsheet. The sheet tracks key performance indicators (KPIs) including sales figures and operational efficiency.

Requirements:
- Correct all incorrect calculations
- Ensure data is updating properly
- Fix formatting issues
- Maintain main KPIs, but layout can be improved

Ideal Skills:
- Advanced Google Sheets knowledge
- Strong attention to detail
- Experience with data accuracy and spreadsheet functionality
- Ability to suggest and implement layout improvements