Q:
Restarted GW2
A:
You might consider taking your character(s) to Dry Top and The Silverwastes. Another thing you could do is purchase Living Story Season Two to get more caught up on the on-going story.
If you are interested in playing the new content (story) about to be released soon, you will need to purchase the expansion. Many state that Gliding alone is worth the purchase price of Heart of Thorns, not to mention Specializations and Masteries.
If you do purchase Heart of Thorns, you would start in The Silverwastes by playing the prologue HoT story step, as well as the first episode in the HoT story.
Welcome return, and good luck!
Also if you get season 2 lving story it gives you fairly easy mastery points.