I'd imagine we can all relate to this happening at one time or another over our quilting lives. For the past 10 years I've found that I like to have two projects in the works - one that is complicated and one that is a simple pattern. The simple pattern for me is Linus quilts. I also do a lot of fmqing and that breaks up the piecing and complicated patterns. Try some different things - I do a lot of repurposing - jeans to tote bags, stuff like that - so will clear out all of the quilting and just do totes and other denim items from the jeans for a while. You'll figure it out - just don't give it up.