@Aspriringwriter2011 You are so sweet! I'd glad you're enjoying Finley and Harlyn's story so far!
Motivation for me fluctuates a lot, honestly. But at the most basic, I have to love the story. I have to love the characters and the world. I have to want to share the story with the world. Write what you love. Write stories that you want to read. That motivates me, because then I can read them over and over again. And that's not a brag of "oh, my writing is so amazing I can't help but read it all the time." I genuinely love my characters, and I write what I love to read. Motivation can still be hard, but that will help immensely.
Past that, it's really personal. Develop a writing habit, even if it's not every single day. Write consistently, whatever that means for you. Maybe you have twenty minutes every morning, maybe you only have the weekends. But just put words on paper!
I hope that helps! And thanks again for your kind words.