Nearly there! The @ISA and @EXPORT_OK should be 'our' variables (not my). This is so that the Exporter module can see them.
I see that you have tried to use a group tag (:DEFAULT) in the use statement, this has to be defined in the module itself using:

our %EXPORT_TAGS = ('DEFAULT'   =>[ qw( list of symbols ) ],
                    # Maybe other tags
                   );
    
Exporter::export_ok_tags(qw(DEFAULT any_others));
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