With the Book 7 level bump, my Minstrel hit level 45. 45 is a turning point in The Lord of the Rings Online™, because it marks the beginning of the late game. You can start all the level 50 content, and there is a lot of it because the game lived at that level cap for a year of updates.
At 45, you can productively visit Angmar, Annuminas, Eregion, Forochel, Goblin Town, Haudh Iarchath, Sarnur, Tal Bruinen, and other random spots that I am not recalling, to say nothing of working on your epic books. That list should probably start “Angmar, Angmar, Angmar, Angmar,” because there is a lot to do there as you approach and pass the old level cap: Barad Gularan, Carn Dum, the Rift, Urugarth, and all those quest chains in Himbar, Imlad Balchorth, Maenad, and Malenhad.
You also have the second half of Volume One and the opening of Volume Two. The only things keeping you from being level 55 before entering Moria are your impatience and the difficulty of finding groups for some older content.