So, I'm a prawn, but 2019 was my best year. 5 figures gross on Amazon. I spent a lot of it learning AMS, which was going well, until it changed in Jan/Feb 2020. I did an audio book for my April release and the narrator is also a fabulous editor. I had a lot of money to spend while I was writing this book and figured I knew more now than I ever did. I have no mailing list and my website is very basic.
My first book was in 2016. I had a cover from the Amazon cover generator. I was so confused I didn't even know how to check sales and assumed Amazon would email me. A couple of weeks after the release they added the dashboard and I was like, wow, look sales. I sold more of that book the first day it released than I sold of my April release this year.
This book - I had it set for a June release with the idea of moving it up to April if I had it all ready. I did and moved the date up. My initial idea was to target the book "You are not alone" for AMS. This plan had worked well when I picked a trade book for AMS as my main target for my release in Sept. I moved the date up and then things got really bad coronavirus wise. I thought of moving the date out but that wasn't appealing. It's a complete disaster.
I think probably with a good mailing list and if you have a AMS plan that works it would be okay. I have neither. There was a big change to AMS and the formula of authors and book titles for keywords seems to do nothing, and at least one author who says they are very successful with AMS says there was a major change, but no one is going to share that info and I am completely in the dark about how to pivot on this one. I can't even think of any ideas.
I'm writing the follow up to my Sept book, which was WWII fiction and I'll probably publish it but I don't know what I am going to do about a cover. I am making chicken feed this year. It's a hobby, so it's okay, but now is not the time to dump money into the business from my family's budget.
Audio - I did it for the experience and to give the book a better look. I've made 13 bucks on audio. I never expected to crush audio but at the rate Amazon is going the audio isn't going to be up for another couple of months so it really was a complete waste of money, but still a great experience.
For both my trilogies I wrote them as one giant book and released them all at the same time. I even released them backwards, over the course of a day or two, so I could have live links in each book to the next one. I didn't think I was a big enough name for anyone to go looking for book 2 months later. My first trilogy is still my biggest seller, and my release in Sept. 2019 is second.
Hope this helps with your decision.