To become an Elder of the clan, this is what you should do:
Master these 6 heroes and you will be named Elder.
1. Rubick
2. Nature's Prophet
3. Ancient Apparition
4. Shadow Fiend
5. Meepo/Beastmaster(your choice)
6. Troll Warlord
If you desire to go above and beyond, master the final hero.
7. Invoker (optional)
In order to be called a master of these heroes, you must have at least 10 games played as each hero in no particular order, but no other heroes in between. (this means no Drow Ranger between Rubick and Nature's Prophet, and so on...)
If you complete this task, I personally guarantee you will feel yourself get substantially better at the game of Dota 2.