Speaking of making tutorials since I also mentioned increasing the font size: I found 2 topics here already about either replacing the fonts altogether or changing the size. I believe Flix provided a fonts.xml with edited values to increase said font size some time ago. But ultimately the user who asked about it couldn't get it to work, saying he can no longer move or interact ingame with the edited file in place. I found that odd because I had no such issues when I changed the values equally myself.
I extracted the "Fonts" folder from "skin-xml.zip", placed it in "Sacred 2 Gold/pak" and there edited the "Fonts.xml" by increasing each value by 2. One thing to note though is if the increase in size is too high some names or descriptions might no longer be displayed correctly and appear to be cut off.
<Font Name="DEBUG">
<FontGroup>TextFontGroup</FontGroup>
<Size>18</Size>
<Flags>ANTIALIASED, OUTLINE</Flags>
<Sharpen>true</Sharpen>
</Font>
In my case I changed the value 18 to 20 and did so for every other entry.
Either way I found the difference substantial enough to make a few comparison screenshots and post them here. I apologize if someone already made a post about it or uploaded a working fonts.xml at some point.
Each screenshot shows a few elements like the inventory or item- and ability preview. From left to right: Vanilla>2pt increase>4pt increase.