I'm going through a phase of absolutely no mojo either. Just a couple of months at this point, though, LOL! The only creating is those "must have" b-day cards and thank you cards.
I think we all go through different phases and for me personally, life is just so hetic that creating is just not appealing right now. But, I still miss it. I just don't have the energy to clean up the mess from the last creative tornado and try something new.
I'm wondering if maybe you need to try another creative outlet (that you could use those supplies on!!): say for example: a mixed media canvas or journal, a home decor piece, maybe just something as simple as a place setting name tag for the upcoming holidays.
OR....maybe it is time to just put aside this particular "art" for a while and try something new. Photography...needle work....cooking class....
Or maybe it is just time to read a book, enjoy watching new movies, play mind puzzle games in the evening.
Do what feels right for you!!