The new Challenge Log and finish your Hunting Log #1. Not completing logs before 50 is a waste.
#2 take your pic FATEs in South Than and Outer LaNos -OR- Level 45 Leves and GCLeves in MorDhona
While queuing for #3 DD and AV.

Optionally, you can use Party Finder for a 1st room grind group in AV and DD. And you should do all of your guildhests on each job before 50 and do your guildhest and low level dailies every day.

45-50 goes very fast. ^_^