Avoid entering the same type of data on various sheets!

Have a single TimeSheet table on single worksheet, where all (daily or weekly or whatever time you use for one entry) info is inserted.

When you feel, that the table will be too long, use autofilter to hide older entries.

Calculating in TimeSheet table months in format yyyymm (or as dates at 1st of month and formatting them as "yyyymm") from your entry dates allows you to keep your timetable over several years (until the workbook will be too slow to be practical - it depends on amount of entered info and how much formulas you have in your workbook and how complex they are).

When you need a monthly report, create one on separate sheet, where you select a month (using data validation list), and all needed info is calculated from TimeSheet table. One single such report allows you do get reports for every 12 months (or for any month you entered data into TimeTable)

Whenever you need some calculations on your TimeTable, having all data in single table will make formulas much less complex, and you never will need to redesign them when you add data for a new month.