I exported XML, used a free text editor “text wrangler”, used find and replace every instance of this code
fontsize
Size
0
1000
24
with this code
fontsize
Size
0
1000
36
it changes font size from 24 to 36
i did the same thing for font color, font style (bold), and font.
It worked for over 500 titles I had to change, and saved me tons of time and wrist wear.
I lost all render files though from other renders.