Carl, when i completed my set of loose figures and major variants (well the ones I could afford) I also felt a little bit lost so i can understand where you are coming from. I really enjoy the aim of completing a set or run. When it comes to an end there is a feeling of "what next?". I started to collect the foreign figures, Lili Ledy, Glasslite, Top Toys but after a while I realised they just didn't interest me in the same way, so now i'm selling them off. I realised that i was so focussed on trying to find a focus that I was collecting things that i didnt like, just for the sake of it - to have the feeling of being able to complete something again. I have kept a few of the foreign figures that I liked but now I just collect what I enjoy. The funny thing is, that now i have started to collect what I like - somewhere along the way I unexpectedly found a new focus!
So to sum it up:
Collect what you enjoy and like.
Dont find a focus, the focus will find you.