(This is going back to Live, not sure how one would play now)
I did manage a L50+ Earth/TA way back, but it was a long, slow road when I couldn't find a team.
Three Holds (4 if you take EMP Arrow, which I normally skip) were great places to 4-slot for Basilisk's
One of those could light your Oil Slick Arrow for some awesome moments (Volcanic Gases and Oil Slick play very nice so long as there are no pets on the board; Pet AI is wonky with the semi-burn patch effect)
Quicksand, Flash Arrow, and Stoney, right out of the box, are great mitigation tools
Acid Arrow and Disruption Arrow, both providing -Res, make your low damaging tools hit slightly harder, but really shine when teamed (the AOE of Acid Arrow is negligible)
I would skip Salt Crystals and take Poison Gas Arrow instead (half the cooldown with a slightly longer base duration, higher accuracy, and without the need to be in melee any more than you have to)
You're going to be awesome when you're teamed and teams will notice when you're not there. Solo... It's going to be slow until you get all of your kit, but, when you do, you'll have one of the safer build out there