If you are writing about a team of investigators or law enforcement or even vampire hunters, you could simply write a string of stories in which every story is a 'case of the week' or 'monster of the week' story with no connection to the other stories in the series other than the fact that the same characters are used in each story.
There are a couple of advantages to this approach. First of all, you get the same advantage as with any series...using the same characters in every story saves you the time needed to think up new main protagonists.
The other advantage is a big one. Even though you haven't got an overreaching series arc, just using the same characters for the stories gives the whole a sense of continuity.
So if all these "A Arcs" and "B Stories" are too much for you to handle, why not take a little time to create a team of characters, give them a job to do, and write a series of stories of them undertaking that job.
Just as overall arc series work on TV, so do what I like to call unconnected 'case stories' series.
CSI, Bones, etc.