You know you answering your question about killing elona and Janus...you cant despite any level you happen to be.(At least not just yet)
I would think that you should try orcs which are level 8-9 though unlss you were talking of orcs which are of a different level?
An easy way of gaining exp is by doing quests,you may want to try and do loads of minor quests to gain a few levels.
You should be able to pick out a few thugs here and there.
