[enesis]

I play at 4k and have a similar problem with the text inside the UI. I have found that you can modify individual .xml files to increase the font size within the related UI window. I use Notepad++ to edit .xml files. Go into the UI directory for the skin (I use duxaUI) and start clicking around. Backup your original UI Folder and then find the .xml file related to the pet window, playerUI, or whatever, and take a look at the variables inside. You can search for "size" and it will put you in the neighborhood of what you need to start modifying. Make a mental note of the X/Y ratios if you are going to start changing window sizes. Keep track of the default orientation if you are changing multiple lines of next within a window.

You can use "Load UI" to check your progress without restarting the game. If you mess something up you can either load your backup/original UI file or undo the most recent change(s) in the text file and restart. I have made only a few changes to the pet window and HP/Mana figures in Player UI. All the changes I have made have been a product of trial and error.