What to do when out of leves? Grind?

[Orophin]

There are 25 sidequests and 3 (almost 4) main quests he could do. What constitutes a plethora in your opinion?

I stand corrected, there are quite a few sidequests in the 10-15 range. However when these quests are only providing 200-500 xp each, it's not really putting a huge dent in your progress. You can kill two or three monsters within a few minutes and get the same xp as it takes you to run around for 30 minutes in some cases for that average of 350 xp for a quest. Side quests are not a viable form of progression, nor were they designed to be.