How Do Writers Measure Success?

I've had what feels like an insanely successful year in a lot of ways. I've sold more than 20 stories this year, I've gotten very nice feedback on some of the stories which have been published, I've made it 2/3 of the way to full SFWA membership, etc.

However, there are still lots and lots (and lots) of milestones which I haven't even come particularly close to reaching. So, looked at against the backdrop of those other milestones, it would be easy for me to say (were I so inclined) "Well, I really haven't accomplished much yet." And, looking at it purely objectively, there's truth to that. If I stopped writing today and published nothing besides what's already in the pipeline then twenty years from now I'd almost certainly have left functionally no mark on the word of speculative fiction literature.

So how do I look at this? Have I had wild success or am I still down on the lower rungs?