UNIVERSAL SHEETS AND WORKBOOKS MANAGER
It is necessary to add A UNIVERSAL SHEETS AND WORKBOOKS MANAGER similar to file manager for OS. Plus different small features as toggling, vertical tabs and so on.
Can you give more details on what you mean by a universal sheet and workbook manager?
Kenneth Barber commented
Keep all similar data in its own table, even if it means repetitive headings and more typing. Then you will find that you will probably only need 1 file and a few sheets.