I started my novel nine years ago....and have almost written another two since then (I am a serial unfinisher!), and started various other things. Last year I decided I was going to finish it, then life got messy as I left my husband but now this year I really am going to!!
I've always wanted to write this story and the ending has been really clear in my mind, but I get bored writing the middle. I know the story after all! I forced myself to write out a chapter plan and decide exactly what needed to go into each...there were a lot of 'X decided to do Y' vague parts that I forced myself to put more effort into.
Now I've got a document for each chapter and whilst I'm mostly writing them in order, I am tacking each section as it's own challenge, creating an arc within that chapter and really thinking about what the purpose of it is in relaiton to the story. It feels a little less overwhelming than tackling the whole thing. I've added about 30,000 words in the last two months (it was stuck at 45k for ages).
I have also paid for an initial editor/mentor on the first 30,000 and just having some conversations about it with her and getting some guidance has helped. That being said, it did take me a year to read her feedback as I was too scared!!
I am using ChatGPT a lot at the moment to 'discuss' my writing with...I like running my ideas through it and getting it's take on the pace of my chapters and ideas for some of the nuance, as well as research (mine is partly historical fiction so I used to get bogged down in Googling, now I have answers in an instant!). Give it a good...tell it your ideas and ask its opinion on which one to go with and how you can move forward with it!