IMO:
norn: finish Asura secondary quest chain and get the Path to Revelations quest. With this active, go and VQ/farm the bosses in Varajar fells (there are guides online)
Asura: VQs mostly / Books
Vanguard: VQs and/or Wintersday quest Snowball adominance / Books
Dendrimor: Secret Lair of the Snowmen farming
Note that Book rewards do not get affected by double week bonus
If you have done War In Kryta on the character, the Hearts of the North chain after it has repeatable mini-missions that one or two of them are pretty short (the 1st and 4th ones, especially 1st and run past foes with a cuppycake it's like 5 minutes or less)
Rewards for each mission:
5,000 Experience
1,000 Gold
1,250 Vanguard reputation points
First time: 2 Medals of Honor
On repeat: 5 War Supplies
(Of note: the 2x bonus week *doesn't* apply iirc)
doing the EotN master title should pretty much max out all your reputation titles especially if you utilise the bonus weeks and z-quests
If you go for eotn title you should first fill all books in nm. Turn them in. Then hm and also all VQs. Can combine it with daily zaishen quests.
Snowmen dung is good for dwarven title.
