I'd plot backwards and write forwards. For me, I would look at each major event, starting with the ending, and decide what I need to achieve that. If it requires more than one thread to get all the ingredients in place then fine. Then work back those threads and repeat the process. If I can make those threads cross over earlier in the plot without forcing it, all the better.
^this
But I'm an outliner at heart. I experimented with a pantsing novel but it doesn't work for me.