Well, first up, there's no such thing as truly unbiased advice - we all have our own sets of filters and paradigms we work with.
The big question, for me, is what do you feel you are missing to not feel fulfilled? Do you feel that this is specific to your current relationship, or has this been something that you have felt in the context of previous relationships too.
I think that it's worth trying to come up with those answers first - post them here if you'd like some feedback. I find it hard to really give advice without knowing this.