If its not an option for you to reduce the height of the font for it to not cut, then maybe changing the line height(which by default is 36) or the padding of the message window will help. Other plugin of mine can do that:
https://hakuenstudio.itch.io/hakuen-studio-message-manager-for-rpg-maker
But if that is a problem not only on the message window, but on menus etc, you may need to change the line height here:
Window_Base.prototype.lineHeight = function() { return 36; };
Add that as a plugin and change the 36 to the number you want.
Honestly, all my experiences changing the line height of the windows gave me all sort of side effects. I really don't recommend. It's better if you could have a font size to be below 36. But you can try with the options above.