A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
You cannot delete rows or columns from a worksheet.
You can hide them only.
Sounds like you have data or simply spaces in cells at bottom of sheet so cannot insert rows above.
Select the little square at top left intersection of rows and columns then Format>Rows>Unhide.
Select rows from 175 to bottom and hit Delete to clear them out. Save workbook.
You may now decide how many rows you want visible and re-hide those you don't need to view.
Gord