You are not out of quests. All sorts of new quests pop at 46-49. Some are at quarry mill, others are at aleport. They are literally all over the place.
To add to the above, there are also quests in walking sands as well in this level range. All thought I didn't visit these places again until after I hit 50 but for that 3 lv gap I did fates to hit 50. Even when I hit 49 and could continue the story I pushed to 50 in fates so I wouldn't have to stop again to work on the story. The pick up of the story @ 49 will only go so far before it requires you to be 50 to finish the last sections of the main story.
THIS ^^^^ I was in same boat.. hit 46 and was like crap I'm outta quests.. so did a lot of fates and dungeons and as I hit next lv a few pop here and there..... finally hit 49 and decide to go to walking sands and get the 49 story quests. I notice there are new npc in the area so I went looking in the back area where they all used to sit.... BOOM 5 ppl with quests and I look at the lvs and they go from 46-48...... Needless to say I jump on those quests a bunch others open as I go and I get literally 450k xp from quests I missed which got me from 49-50 in like an hour.
Also don't forget to unlock zones completely.. at 46-50 you will get roughly 1800-2500 xp per area unlock and that x10 for full zone unlock look under achievements to see what zones you still need.. dungeons don't count tho lots of xp to be had unlocking zones