It's took me a few years but I finally got there! It's helped that I've had quite a few smaller challenges as well as bigger ones so I've been able to tick a fair few off.
If you're wanting to up your ranking too consider adding some smaller, achievable goals ... not all of them have to be profound and life changing!
I found and bought a pack of cards entitled '500 Things to Do Once in Your Lifetime'; some of the things were silly meaningless tasks like 'talk like a pirate for a day', others were more difficult and involved, like learning new skills or travelling to far away places. I basically put all these things on my bucket list and started working my way through some of the more achievable ones, and of course, marking ones I'd already done; learn to drive for example.
So yeah, definitely add some odd ones in there!