So Bored...what to do endgame besides jip noobs and pvp?

Topic says it all

edit: decide to comeback and do what?

Nothing. Take a break from the game find something else to do, or other game to play. GW will be here when you decide to come back.

Make a new character, maybe work on some titles, try for some fanciful armor, get a bunch of skills, take care of any stray quests..... so many options!

accumulate a stack of ectos ... then give it all away.
repeat.

PvP
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Find a fun guild or online friends and do stuff together. Play around with people help out in low level areas and make yourself look like a god to all the newbies that just watch as you solo 50 Charr at once...

There are so many things to do. FoW, Underworld, DoA, HA, TA, RA, AB, side quests, Elite Missions, the upcoming Hard mode, create a new player, try to make 100k in Pre, the list pretty much goes on.

Try a class you've never done before. Take them through Prophecies. Nice and slow, plenty to take in. Don't go to Factions or Nightfall and get the easy levelling, just go the old way. Along the way to the end of the game, go for Survivor or Protector of Tyria. If that doesn't appeal to you, try other games and come back to Guild Wars later. Cake is good, but you can't enjoy it all the time.

What does "jip noobs" mean?

Well, err, hey there Bacon. Is the "cycle" coming to an end yet?

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As for me...I tend to work on titles on one character...accumulate nice weapons for the rest. Buy up skills and cap elites. Generally prepare my characters for the next chapter.

titles, alliance battles, RA, HA, make new chars, cap skills.

Start a new (different class) character and repeat. For instance try the underapreciated (but overpowered if played correctly) mesmer.

So far I've finished Ch1 on all 10 different characters, Ch2 on 8 different characters and Ch3 most of them are past half-way now.

There are plenty of things to do. A lot have already been mentioned. Titles, Titan quests, kit your chars in 15k or FoW etc etc. There's plenty to do, but if you can't find anything you like, then give it a break and find something else you do.
Only thing I can think of is harassing or something along those lines.

Hmm, well if your favorite hobby is "jibbing noobs" then I'll suggest that you find a different game to play.

The best way to keep an interest in a game is to set a long term goal for yourself. Just find the one that interests you the most.
1. Getting expensive armor
2. Getting that way cool "gotta have it" expensive weapon.
3. Collecting minipets
4. Capping every skill in the game.
5. "People know me" title.
6. All 3 cartographer titles.
7. Rank 12 in PvP
8. Holding Hall of Heroes.
9. Start a guild and build it from the ground up into a competitive well-known guild.
10. All of the Above (That should keep you busy until Expansion 10 is released!)

EDIT: Hey, Bacon!! I need some ectos!

Run to Droks naked. Backwards. While drunk. From Beacons.

Since you excluded trading and PvP... Grind?

It's "gyp" not "jip"....essetially a racial slur towards gypsies, meaning to cheat or rip off.

Make collections:

Current Goals for me:
1. Complete Elonian Green collection (already finished Tyrian and Canthan)
2. Collect all mini pets (just need panda and ghostly hero now)
3. Get all skills on one character (378 left to go on my ele)
4. Get all armors (Just need to make space for the 1.5k armors and I'm done)
5. Max out titles

Rinse and repeat 3-5 for each character

seriously mr OP, you have to be kidding. there are so many things to do