Last year (or was it two years ago?) I did a 100 day no buying challenge. I made it about a week past the 100 day mark, and felt pretty good about it. About the no buying part, as I recall not a whole lot of knitting got done, so not a whole lot of stash got moved out.
This time around though, I have planned projects. I have several WIPs that I'm focusing on. Stash will move out! I have been stalking a Ravelry thread for finishing WIPs this month, and have 'joined' from home (not by officially joining the threads, just reading them for motivation). And have been following a thread called 100 Balls in 2016 as well as a destash thread.
Finish WIPs before casting on a new project
No buying yarn!