Countries are small and not everyone can be a best-seller author with millions of copies sold. This is a general difference. In North America you see that writers who are considered, both by critics and the public, to be good writers, are usually best seller authors too. One goes with the other. I don't see someone considered an important writer who also is not selling well.
Importance is connected with success.
A writer does not have to think oneself in those terms, although sooner or later the system will make the writer think that way. The system will tell you that if you want to be successful you must write a book that everybody will buy and read. Of course I am not saying every writer thinks this way here or every publisher works this way. One because of the quality, the other because of its success, the business quality, I guess. Your writing has a preoccupation with family life.