I think there is inherent wisdom in you bringing up the topic yourself and where you feel with it. I think you're ready to begin thinking about the process. That doesn't mean you should have your last session next week, next month, or even necessarily next year. But therapy is one place where we really get to choose our "happy ending." That said, I wonder whether you want to cultivate joy in the ending of therapy-- if that might be one goal, rather than just a singular focus on the absence of a specific "need" for therapy. It's okay to stay in therapy because you want to, not just because you need to. That's an investment in yourself, an "exercise" (which I intend to mean as something one does regularly, keeping the muscles toned) in self care.