Generally, package data should be smaller than a megabyte - if it’s larger you’ll need to argue for an exemption. This is usually easier to do if the data is in its own package and won’t be updated frequently. You should also make sure that the data has been optimally compressed:
Re-run usethis::use_data() with compress set to that optimal value. If you’ve lost the code for recreating the files, you can use tools::resaveRdaFiles() to re-save in place.
will need to be reduced/moved for CRAN.
From https://r-pkgs.org/data.html#data-cran :