What do I do?
You might try the ‘Player Helping Players’ sub-forum, for a start. The Wiki, accessed in-game (type /Wiki [topic of choice] in chat) or via the link above is a great all-things-GW2 resource.
Park your boosted L80 character and create a new character (Elementalist or other) and level it up naturally. Pay attention to the tutorial tips at each level-up.
Welcome to Tyria, and good luck.
Well, one of the things you might want to work on first is your ascended gear. It’s a flipping grind and will cost you a lot in gold, but it’s the only way to do raids and high level fractals. Other then that, the end game mostly relies on you to make your own fun. Do WvW, start a guild, get a guild hall, do dailies, get titles, finish achievements, create your perfect armor set, do fractals, do jumping puzzles, etc.
If you have an enormous amount of spare time, and infinite patience, have a go at the Chalice of Tears JP in Ember Bay.
If you like to get achievement points (AP) you can hunt those. The list of possible AP is on your Hero Panel on the left, under achievements. You get 10 AP a day for doing the dailies and the Wintersday event is on in Divinities Reach (the human city) on the west side for a few more.
ANet may give it to you.