I feel this thread has reached its conclusion. And the remainder of the thread will likely debate motive.

Chances are, a solo player is soloing due to time constraints or unable to put in consecutive hours of gameplay. In which case, leveling up will take longer, whether leves, behests, or solo grinding. Slow and steady. And it may take months to rank to 50 like this when focused on a single class.

But if more time is available, say three or more consecutive play hours, and the objective is to level up quickly, then we know, solo is not nor was ever the most effective way to level up an adventuring class.

What city offers the best leves for solo person's time? I dunno. I have a feeling it;s still not Nanawa Mines related.

@pulseczar Thank you for your input. Your post is still a real answer to me.