Get Calibre & the de-drm stuff installed...
then convert to azw3
with Charis SIL font
thread for JSWofl's fab font here:-
https://www.mobileread.com/forums/sh...light=chareink
It's embarrassing how poor the built in fonts are in Kindles compared to Charis SIL.
Embed that Chareink font, and once on your Kindle you can choose the 'Publisher Font' which will be ChareInk.
Also install the Hyphenate This! plug-in so you can have proper hyphenation in the azw3 book.