I think parkour in general in minecraft is just like anything else, practice makes perfect! There are Youtube videos out there that give you some tips as to how to perform certain jumps, and show you what's possible (and what's not) and under what circumstances. Those have helped me improve a lot since I've gotten back into Parkour.
Single neo jumps are just a baseline for all the different varieties of difficult jumps, so they aren't going away anytime soon. Take some time to practice them on a plot or on maps in the Practice World! Not everything comes with ease.