Like Joe said, you may try washing the yeast. I just started doing this and have had great results. Here's a link I used to get me going: http://billybrew.com/yeast-washing
I read the link and it mentions that washed yeast can be used a few weeks up to maybe a few months after washing. Is this a reasonable estimate? I'm going to bottling a belgian golden strong in the next week or two, and probably won't make another Belgian until next January/February. Would I be better off just getting a fresh vial after that long?