I hope to one day have a book published by a major publishing house.
... most women aren't into this type of material.
You are not alone. I suggest you google 400,000 word novel (roughly your estimated length).
Other people have 400,000 word unpublished novels asking for advice. The answers are exactly what you don't want to hear (same as here) but they will drop statistics and specific book titles to back up their answer.
where do I go from here?
- Write for yourself, with no intent to get published –– which is frankly what you are doing now. Don't chase commercial success as an
author (financial success is almost unheard of). Write until you
alone are satisfied.
- Cut your book in half, and then half again. Most genre novels do not exceed 100,000 words –– and plenty of publishing house readers
say that a book that is too long will be eliminated, un-read. It
won't even be considered.
- Partition the story into a trilogy, or tetralogy. You will have enough words for 4 books. (If you do not have enough story for 4
books, that's a problem.)
- Get a cost estimate of self-publishing a 1000-page novel (again, roughly your estimated length). Put a monetary pricetag on the
expense of creating the physical book. DO NOT self-publish, as you
say you have little interest in socially promoting, and you doubt
the style will appeal to a broad enough market to recoup the cost
per book. (Ergo, go back and consider #1)
Hiring an editor?
There's talk about how expensive getting a professional editor can
be—the longer the manuscript, the higher the commissioning cost.
You should not consider hiring an editor until you've cut your book down to 200,000 words or less. You will be paying them to cut the book down to it's best 100,000 words, so it is not automatically rejected from the publisher's slush pile.
If this is not acceptable, you simply do not have a commercial novel. This book needs to fit inside the delivery pipe, which includes publishing costs, shipping, promotion, shelf space (even if digital it will require investment to make it sellable). It's a business.
Compromise, or don't.
That said, there is no reason not to write for your own satisfaction, tell the story as you like, and worry about publication later (if at all).
It doesn't sound like you have any interest in reaching a large reader base, or 'selling out' to more closely align with popular taste.
You may change your mind once this story is out of you. You may feel you can edit it down, or you may discover you have a smaller, more sellable novel inside you, and start that project with a shorter page-length in mind.