Running out of goals: Achievements.
well theres a new event each month that gives about 400 AP, then doing all your dailies. So you can get about 1k a month basically.
Go for the WvW achievements then. They are so rediculously over-sized, you will always have a goal :P
Have you done all 8 champs in PvP too? if not, get to work. Should put you a good way towards Marauder too due to the number of games you’ll be looking at.
You have time to do every achievement after maxing out your PvE and sPvP dailies?
Not sure what you mean by ‘just’ living story. They plan to release new permanent and temporairy content every two weeks, what exactly are you asking for?
You have slayer and champion slayer? Do you have champion genius, illusionist, etc? Champion Brawler?
If your getting bored of achievements you can always join a tournament and have a chance to win $10,000. https://www.guildwars2.com/en/news/announcing-the-guild-wars-2-invitational-and-regional-qualifying-tournaments/