[Gustoo]

Rogue is hardest class in game to solo. They are the worst at it.

I don't know how you lost an entire level de-leveling though. Whatever you were doing when you were doing that, avoid it.

Find mobs that are good exp for how difficult they are. Don't kill monsters that can almost kill you. That gets to be impossible pretty quick where anything blue con can murder you fast. The game is designed for groups.