I have a book that is nearing completion. Because the current circumstances might increase interest in the book and also the Christmas sale is coming, I would like if it would be a good idea to self-publish it now (e.g. on Amazon Kindle) and later send a changed version of the book to a traditional publishing house?
The idea is that I would like to add more material to the book - but in order to do that, that takes time I currently don't have. I don't plan on a radical rewrite, but rather to make the book more substantial.
I know that there are questions like these that deal with the case where one tries to get essentially the same book published the traditional way and that seems to work if the self-published work is a commercial success.
I guess what I'm asking here is: If the self-published work is not a commercial success, when does a changed book count as a "new submission"?