Guild Wars 2

I’m kinda new into this game so forgive me for dumb question.
When I press “M”, I see that I made 78/189 hero challanges, and I have 78 hero points. I have maxed all skills and specializations to unlock elite specialization, but it cost way too much by my opinion. I need 400 hero points to max it, bit I only have 78 right now + I need to make 111 more hero challanges over the map. So that will be 189 hero pints.
How can I get 400 of them to finish elite specialization Berseker?

I’m warrior level 80 with 1 gold star. I’m still not sure what that gold star means and how I even got it, but it seems like grinding mobs won’t increase those gold stars xD

The Hero Challenges in the new maps introduced in Heart of Thorns are worth 10 points each. Go seek those ones out and do them to attain your Elite Specialization more quickly!