Closer

Some characters, the M for instance seem taken from Pump Triline

Looks like a wider Frutiger

Thanks, that's enough. Going to the webpage of Adtail Newblue, the authors, you can see the fonts used.

Is it form a webpage?

It's curious. In the Quicksand available in Google Fonts (https://fonts.google.com/specimen/Quicksand?query=qui&preview.text=LovelUp&preview.text_type=custom ), the l is taller than the U, but in Dafont it isn't.

No. It's Mason Serif Alternate.

Go to the link to Myfonts. Write the text. In the "ff" on the right tick "Stylistic Alternates" and the result is

https://i.imgur.com/tIPjuCC.png

No. It's Mason Serif Alternate. Look at the "E", for instance.

A free alternative could be Montserrat (https://fonts.google.com/specimen/Montserrat?preview.text=NEW+FRIENDS&preview.text_type=custom&query=mo )

Si tienes el pdf del libro, en Acrobat reader puedes ver en Propiedades las fuentes utilizadas.

The font is Amazon Ember, a custom font, as you can see inspecting the webpage.

It says there that it is a custom font, it has been designed specifically for this project.

Using the Stylistic Alternates

Similar to Avenir, but not the same.