1. Check circular reference formula carefully to verify that all cell references are correct and point to valid cells.
2. Update cell value which are involved in circular reference loop, as changing cell value may break the loop.
3. Try to use Cell Name instead of cell address where ever possible in the formula
4. Add new sections in the worksheet (new columns and rows) and update the formula if required.
5. Look for any circular reference errors in the cells and fix them as required.