Well, most of the suggestions have been listed, what could be done is to:
Make a new character - It lets you play Guild Wars in a new perspective. You get to be that role you thought was so nifty to watch.
Play Hard mode - It may be hard since you do not have access to Heroes, but there are bound to be players who would love to vanquish an area with you.
Get new elites - Sometimes it is nice to have a variety of skills. It is not always fun to run the same build for the 100th time, don't you think?
Get a new campaign - Some people have the problem with buying a new campagin, but getting a new campaign now only allows you to get or armors and skills, you have a new challenge to overcome!
~Factions - A great campaign to start and try new professions. With the quest rewards up to 3000xp, what could be more fun? Also, there is an ease of access to max collector armor and basic elites too.
~Nightfall - Not quite the fun starter island, but Heroes are a plus. Also, you can challenge yourself to the elite dungeon at the end of the game as well. There are some useful Necro skills here too.
~Eye of The North - Well, 10 new necro skills, but quite the challenge to get you to keep on playing. The armors cost 10k too, but with the trade-off of having rank 5 in the title of the area (which isn't too hard). Also, you can acquire heroes too.
Since you are a necro, each campaign offers quite the skills to make you want to try new builds and elites such as [Spoil Victor], [Order of Undeath].
Hope this might help you decide on what to do.
P.S. I finally understand the "12 chars" thing now, alright? You know I don't know these things, like Shatter Hex doesn't remove the brown arrow pointing down
EDIT: When helping new players, they have no idea that a Hex is a purple down arrow and a condition is a brown arrow pointing down.
