With no offense intended, based on several of your recent questions, can I review the basics for you?
1) write a damned good book
2) then write another dozen or two dozen
3) smack dab in the middle of a genre
4) in series
5) Pro cover and proofreading, and upload the ebook
6) treat your fans well
And that's pretty much it. That's 80% of your income right there, with judicious/smart advertising providing the next 15%. Don't think about this other stuff. You are thinking about squeezing for the last 5% of income, and that's not where to put your energy at this early stage. Put it into the first 80%. Get books 2-6 done as fast as you can write good books and only then think about advertising first in series or loss leader novellas.
Trade publishing stuff aimed at the top .5% of their writers has no relationship to indie prawn publishing. Forget about all of it.
Go read written word media's yearly articles on what 100K indie writers do to make themselves solvent indies. Model your business practices on theirs.
The last Author Earnings check of seven-figure indies had them with total titles of: 162, 51, 78, 64, (etc) books. Think about those numbers.