I’ve been debating this on and off during the year, and I’ve come to the conclusion that it’s not a good idea to put more than a few books in any one series. After you get beyond book 5, things start getting complicated.
What I’ll do is label books in the same “world” a “Collection” (as I have been doing on some) but I’ll divide the books that specifically link up to each other into “series” to help people find books that directly link to each other.
For example, Eye of the Beholder, His Redeeming Bride, and Isaac’s Decision really are a series within the series. Another example is Catching Kent. That will connect with His Convenient Wife and Jacob Larson and Adam Larson’s future romances to make for four books where we see the same characters intertwining in the books.
So I’ll be categorizing the books that span more than three or four books in a series and making them their own series.
The series that will stay in order are those that only have 3-4 books in a series already, like the South Dakota Romance Series and the Native American Romance Series.
Ruth Ann Nordin's Author Blog 
Have I mentioned how I like the fact that most of my books are stand alones? LOL. I honestly don’t think I could do more than a trilogy. And I’ve only done one of those. I can’t imagine how confusing it would be to try to write all those books in a series. With yours, you can usually read them separately, but if you read them in order, you get to know everyone down the line. I admire anyone who can think of that many stories involving some of the same people. I wonder if I can’t because I have a short attention span. 🙂
I don’t blame you on wanting to do stand alones. It’s hard to keep everything straight in a series, and the longer it gets, the worse it is. From now on, I’m not expanding a series to more than four books. I can see doing stories with the same characters that pop up, but anything where it all connects so much is too much.
I will say that as soon as I started dividing up the Regencies and the Nebraska books into different series (instead of making them all one series), it felt like a weight’s been lifted off my shoulders. I’m free to disconnect myself from some characters that pretty much have nothing else to add to a future story and now I can focus on other characters that will be better served in either a stand-a-lone novel or a new series. I didn’t realize how much pressure it’s been to force characters into new stories until now. Live and learn, right? 😀