Hi Leuchi,
Just waiting for the word "health" to be added to the back cover. Also if the spacing becomes like this... make sure you fix it.

Hello dear Leuchi, I'm very very sorry that I'm asking you to make updates. But I called KDP. They advised me that the text is not good and that it will be difficult to read. You can see in the photos I just uploaded. In particular... the names of the people are hard to read. The world "inactive" on the FRONT, BACK and SIDE are all hard to read. The Doctor of Naturopathic Medicine is also. I'm not sure what to recommend. Darker? Different text. The inactive needs to be darker definitely... maybe a little larger.
Also see in the YELLOW section, the text is not centred. They are cutting along the black and white lines. Did you make a larger space for a reason? perhaps you are the expert! If you did that for a good reason then just let me know. That is okay. If it was just a mistake then please center it.