One thing that might help is have a whiteboard in your house in a place you will frequently see it. Write the name of any project you want to finish on it. Writ

One thing that might help is have a whiteboard in your house in a place you will frequently see it. Write the name of any project you want to finish on it. Write the name of any new projects on it. It might counteract, to some degree, the tendency to ignore projects you're bored with in favour of the new shiny project.