In reply to Bridget.

There is the plugin Disable Gutenberg Blocks – Block Manager https://wordpress.org/plugins/disable-gutenberg-blocks/ that I use on sites to disable blocks that won't be used or to disable blocks that offer the same features of other blocks. Even though it hasn't been updated in a while, it still works and the functionality is simple enough that it should not need to have regular updates to keep working.

You can then use the plugin Find My Blocks https://wordpress.org/plugins/find-my-blocks/ to find used blocks and compare that to the list of blocks that you want to disable.

Not a perfect solution but will greatly reduce the number of blocks that you have to worry about.