Hi, Question Please!
LB is a power weapon, so try to find gear with Power, Precision and Ferocity (Berzerker).
Since you are still leveling, try to get your crit rate to about 60~70% with Precision, then go all the way into Power.
If you feel that you are dying too often, add Valkery (Power, Vitality, Ferocity) or Soldier (Power, Vitality, Toughness) among your gear, but try to use those the least you can.
(and the other 8 elite specs maxed too)
There are no “builds” for anything below 80 for the most part. They generally require synergies of all of the talents, sigils, runes, consumables to be a complete build.
If you love Longbow prioritize Power > Precision = Ferocity and mix in Toughness/Vitality if you need it. I can’t remember what level you start getting triple stat gear (Berserker, Valkyrie, Soldier, etc.) so just follow the aforementioned prescription.
While you’re leveling don’t worry about trying to take traits found in lvl 80 builds. Just take traits that will be most beneficial for you at that moment since they’re free to reset.
One more thing. Do yourself a favor and try as many different weapon, stat, trait, pet combinations as you can dream up. Bearbow is dreadfully boring and leveling as such generally doesn’t promote skillful play.