The highest resolution of the Epson S31+ is SVGA (800x600). That's 77% less resolution than the most frequently found native projector resolution of 1080p (1920x1080).
This data projector's resolution (SVGA (800x600)) is in fact the worst resolution across all projectors that are a similar age to the S31+.
The best resolution across comparable types of data projector is DCI 4K (4096 x 2160).
If the resolution of this projector is not high enough for you then you might also want to look at the Epson EX3240 ($339.00) (SVGA (858x600)), the Acer X1278H (WSVGA (1024x576)), or the Benq SX920 DLP XGA (XGA (1024x768)).