The Bookbub is on the 20th, so 2-3 days after is going to be right before Christmas. If the preorder goes live then and I announce it to my mailing list, I wonder if that's a less than optimum time for the open rate?
What about the missed chance to have the link to the preorder page inside all those copies of Book 1 that will get into the hands of new readers because of the Bookbub? I supposed I could link it instead to the Coming Soon page of my website and maximize new newsletter signups that way?
I feel like there's a terminology problem here. In my world, which I like to think is the consensus of indie-dom over the last few years (since I've been active on forums for years and post several times a day and have read thousands of posts), (but I may be wrong!)..."a pre-order goes live" means the pre-order period has ended and the book is now live for immediate purchase.
It appears to me from my reading of your post that what you're actually talking about is for the book to be published in pre-order, rather than "going live." Live is "I can buy the book and start reading it right now."
But again, I may be wrong about YOUR intended meaning.
In any case, IMEO (in my expert opinion, yes, I'm willing to claim that) the optimum strategy is this:
- Publish the book 5 in pre-order status 2 weeks before the Bookbub. Publish the final draft, finished and perfect. Make the live date 2-3 days after the Bookbub. You could set the price at a discount for your mailing list people if you like. I suggest 2.99. Then don't touch it.
- 1-2 days after you push the button to create the pre-order, you should be able to get the link from KDP. You don't need to have the book go live for that. Just use the "View on Amazon" function and it will take you to the sales page, where you can get the link.
- Put that link in all your live books, especially in Book 4 for a "buy now" button. The link won't change; it will always take you to the book sales page whether in pre-order or live. In other words, there is no such thing as a "pre-order page." It's the sales page, no matter what status the book is in. As soon as you get that link, you can put it in all the books and be confident the same link will take them to the same page all the time, where it will be live on its live date.
-Announce the book 5 being published in pre-order to your mailing list, 1 week-ish before your Bookbub. Tell them it's at a discount until it goes live, if it is. DO NOT change the price until it goes live, upon pain of disaster. I did that once. Bad idea jeans. Don't touch it until it's live for sure.
- If you discounted the book in pre-order, once it's live, you can update the price to be hat you want it to be permanently. I like to do a 2.99 pre-order for my mailing list, and bump it up to 3.99 or 4.99 once it goes live.
Does that clarify things?