I really wouldn't mess with it too much and just give it time. I think patience is the hardest skill for home brewers to develop
If after 2 more weeks you still have the same gravity reading you could try repitching some SafLager S-23 with some yeast nutrient as a last ditch effort.
By the way, did you mean that the gravity reading you took was 1.050 or 1.005? The former means the yeast still have a lot of work to do and the latter that you're probably ready to bottle.