Okay, if that's an uncorrected reading, that could be the problem.
Refractometers are calibrated to measure the density of a sugar solution -- like wort. Once fermentation starts and alcohol is in the mix, the readings are seriously skewed. But you can still use a refractometer (I do,) you just have to apply a correction formula for fermenting or fermented beer. There are calculators available online, Brewer's Friend has one for example. Maybe someone can recommend another. (I've incorporated the correction into my own spreadsheet, so I'm not too familiar with what's out there.)
I'd guess that you've reached a perfectly reasonable final gravity already. Maybe not exactly 1.008, but that's just Beersmith's prediction anyway, your actual result will vary because of many factors.
If you already corrected the reading, ignore all that... and try raising the temperature to room temperature to reinvigorate the yeast (assuming this was a cold lager fermentation.)
Good luck, and welcome to the hobby and the forum!