I have had this camera since new, have the same monthly routine, reset the shutter count to zero, just the last month.
I just tried to reset for December 2021 and to my surprise I have forgotten how to do it!!
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You can’t reset the shuttercounter to 0
What you can do is reset the picture numbering on the SD card to start again with 0. The easiest way to do that is to format the card (provided you have first copied all pictures to an external harddisk.)