Help with mastery points

Hey guys, I started my journey to craft Chuka Legendary Shortbow.

I completed the first two parts Chuka I and Chuka II.

For the third one I need to unlock central tyria masteries to fully unlock the legendary craftings (I miss the third and fourth).The problem is I am only rank37 and I already collected the mastery insights and the jumping puzzles ones... the others seems so difficult to acquire even tho people said there are so many extra spare mastery points, more than the 49 needed tu fully unlock central tyria.

Is there a list of the easiest one to do? The living story season 2 achievements are difficult? I already completed all LS2 but i don't know if i am able to do the achievements, they seem pretty hard, like never die or get hit by certain things.

What else i can do?

I never done fractals too...

I don't know what to do.