Excel Numerical Data Formatting Cleanup

I have a spreadsheet of purely numerical records that needs to be put into a clean, analysis-ready state. The core task is to correct every formatting issue—numbers stored as text, misplaced thousand separators,... (Budget: ₹750 - ₹1250 INR, Jobs: Data Analysis, Data Entry, Data Management, Data Processing, Excel, Excel Macros, Excel VBA, Visual Basic)