I too, started a novel a few years ago, and while I still work on it regularly, I'm nowhere near finishing.
Part of what stops me from just finishing it, are the discouraging advice out there that a first novel has to be 100,000 or fewer words. My novel looks like it will be duology at best, too much for a single novel, but not enough for a trilogy.
My novel toggles between present day era and Victorian era, and involves a group of people with specific challenges in life today, and a group of people from 150 years ago with different challenges. Reading between the eras, the reader should come to the conclusion that there's a connection between the present day characters and the Victorian characters, and why they have found themselves in the situations they are in today. I am hoping that once the book is finished, the reader will want to read it again, knowing what they know, so they can have a fuller understanding of the details.
The plot involves romance, karma, family drama, class differences, second chances, and depending on what you believe, the supernatural or superstition.