Euhm, oops.
That is not the way you should do it. (We’ve all been there and made those mistakes).
KiCad can work very nicely with Hierarchical sheets.
With Hierarchical sheets you have a “main” or “top” sheet, and you put the stuff you want duplicated on a separate page.
Then you simply make 4 links to that separate page from your “top” sheet.
It’s explained in much more detail in:
If you’re using Hierarchical sheets, then you can also use the “Replicate Layout” plugin (Search this forum and/or github for it).
With the Replicate Layout plugin, you design the part for one of the 4 sheets on the PCB, and you place a reference Footprint for the other parts, and then the plugin replicates the layout for the other instances of your hierarchical sheet.
You can run the plugin multiple times. This is especially handy when you make revisions of your PCB, or when you’re learning to work with the plugin.