One piece of advice that I've got from a therapist when it comes to creating projects (such as poems, scripts, music, videos, etc.) is to try and make the conclusion first, then work my way through to get to that end. I know you said you create projects in a linear fashion, but is this something that you've tried before and/or want to try out in your music or videos?
i've been doing it for many years now and it works very well