I Cannot Get To The Other Yardbirds Because Theyre In The Vigrid Roughland, Mirkholm Keep & Ravenscar .. What Do I Do Now?
You continue to follow the storyline, and eventually you will get access to those areas.
Quests to Return to Grizzleheim:
Level 20 – Trade Voyage (go to Northguard and Savarstaad Pass) Level 25 – Lending a Paw (go to Vigrid Roughland) Level 30 – Full Grizzle Jacket (go to Mirkholm Keep) Level 40 – The King and I (talk to Valgard GoldenBlade). He gives you “The Bigger They Are” (go to Nidavellier to defeat Jotun)