You should not ever run out of quests .... that gets me confused. You always have a main story quest active, since that is what drives the whole advancement progress.

I am trying to think of a situation where you would not even have a story quest active, but I can't think of any. You missed something. You probably need to go find a person, or sail to a place in the skyway, or *something*.

There are sidequests everywhere. Revisit older places, like Frogfather, and Scrimshaw, and such, and complete thoses quests if you wanted to. But you would eventually run out of those quests.

This is inconceivable, I am a level 50 swashbuckler and my main line quest is still there. I do not understand predicament, look through all the old places you are supposed to go to

You can't run out of quests, so I would suggest looking through your quest log again and/or look around for quests to do.

In following the main quests, one finishes and another immediately begins. There is no declining it like you can with side quests.

Either you lost track of the main quest line, or you need to contact support to see if there is a glitch and have them check your logs.

After four days and several useless responses from Kingsisle telling me I needed to do a quest series that not had I already completed but I already had the end reward companion that the quest was supposed to give already on me they completed the quest for me (by completed the quest for me that means they forced it completed as my character didn't change position or anything so they couldn't have played it). They told me what the next quest was and I ended up doing a web search to find out who I needed to talk to in order to start it up which did work. This problem did happen, and if everyone had read through the message boards three or four other players were having similar problems at different levels often due to bosses not appearing/loading the first time they entered a quest area. In any case, my situation has been resolved.