Finally after a long wait and playing everyday, I finally reached Legend League at 5001 trophies.
When I reached 4970+ I bought shields so I wont get attacked.
Some tips to reach 5000 trophies.
- attack more than you defend
- use troops you are used to, even if you only get 1 star per attack
- patience, patience, patience
Thats it. Good luck to you, I hope you reach Legend League too!