Group questing is the fastest, and probably more enjoyable, or else you're just making a MMORP open free realm game basically a anime universe for grand theft auto.. 1-50(+/- 10) you should have no problems.
The game is active in lower levels due to its new appearance on steam, but still nothing compared to how it was before, also leaving the higher levels too isolated to make the game enjoyable, which is why I have so many smurfs.