I think everyone has different aptitudes.
I started training, at least once a week, with my friend Adroit about a year ago. He's always been able to jump farther and higher, and he's put more work into flips and kongs. His wall runs and precisions put mine to shame. He can double kong, I can't.
On the other hand I've usually done a bit better with techniques involving spinning, probably due to four years of Tae Kwon Do back in the day. So, I can 360 precision over longer distances, perform reverse vaults ambidextrously, do 360 cats & bar grabs, etc. etc. Also, I've worked on cat-balance a lot more, so I'm better at that than he is.
My point is, while the path others have taken may help you find you own, it will still be your own path. Only you can find it, only your feet can take the right steps.
That being said, I think it's always good to work on the "fundamentals" of parkour: the basic vaults, precisions, QM, balancing. If you consistently put work into QM & balance (i.e. walking on rails or cat-balancing on them) for at least three months I promise you will improve in every aspect of parkour.