Hi there Maie! I finally had the courage to do my introduction post earlier this month. I'm glad you went for it too. I actually have many of the same goals that you do! I'm working on branching out and having multiple revenue streams. I'm finally at a place where I have more confidence and courage than ever about sharing my adventures, art, and garden designs, etc.

I'm working on learning a new language too - French, because it's something I've always wanted to do. (I speak English and Spanish too)

And I'm working on some different books too. One of them is a garden book teaching people how to create a garden that is a perfect fit for them.

I was thinking that instead of asking yourself "what would people read?" you might want to ask yourself, "what story do I have to tell?" or "what do I want to write about and share with the world?" I think it might give you clarity about your book.
I read a little book called "You Must Write a Book" that really helped kick start my writing and help me set goals, etc. It was really helpful for me, it might be for you too.
Well, I wish you all the best in your goals. I'll be working on mine right along with you. Here we come!