Want to switch themes

First I am NOT a web designer. I started with a website for a book I wrote: https://www.whensomethingswrong.com/ I never did much blogging on it because I didn’t know how to and I have chronic fatigue syndrome which made it hard for me to learn things (brain fog) and do things (fatigue).

I have improved some in my health, and started two blogs on WordPress.com: https://whispersfromthefather.me/
https://tinascocina.com/

I found that I like blogging and like being able to play around with my own web design using easy templates.

Now I want to change my book’s website and either make it into a blog site on WordPress.com or keep it at www.ads-software.com but be able to do my own web design (if it is easy….I need easy folks…simple instructions). I want the site to be more about just my book…which is why the custom theme won’t be applicable now.

What would you suggest? I want to blog more than have a static website, but this website does have a blog with it…..do I switch it to a blog mainly? What would that require? Should I keep it as a website? Are there easy themes I could use?

Thanks for any insights. This very beginner blogger/ website newbie appreciates it. ??

Tina