CW, If you are selling on Amazon. You might try the Kindle Unlimited option for your books. At least you get a small stipend for each read. rather than "selling" for $0.00 which gets you $0.00
Sorry, but I don't sell at $0 (I was mentioning that i tried discounting 100% instead of 75% for the first book in each series, and it was a massive fail. I 'sold' a bunch of first volumes, with only 2 sales of every book in my catalog, none of which were discounted, but the discounts didn't sell any other volumes in the series, which was the whole idea). I try to differentiate my books based on quality rather than discount, because of the size and volume of each book.
I tried Kindle Unlimited, as it didn't go well. To sell well with Unlimited, you need a bunch of other free books (i.e. high volume on Unlimited, behest by very short novellettes (under 30,000 words, in most cases). My first experiment got 1,000 reads the first afternoon, which petered out over the next week as those readers finished, and I earned all of $2 for the first month (before I was even allowed to run any countdown deals)! Big whoop.
Since I don't write for the Unlimited market, I'll stick to my existing market rather than changing my approach. It works for several people, but it's a highly specialized market.
Chris (?) made a big deal of hawking KDP Unlimited, but he wrote little but porn, each under 10,000 words (little more than short stories, shorter than most of my single chapters). We long argued about whether Unlimited would work for anyone not writing specifically for it, and I'm now convinced it just doesn't mix.