+1,000,000 to this.It might be better to let it lie fallow for now, and come back to it after you've got a few more books under your belt so that you can apply what you've learned from writing them... just sayin'.
Marissa, who did that with the utter stinker that was her very first book.
Based on my experience and that of many of my associates, putting a work away, especially a first novel, can be one of the best decisions for moving forward and making progress, even though it can be so very hard to do.
Trunking a novel is letting go and freeing yourself, not giving up on it. The trunked novel isn't going any place. That new idea and project you are excited about? My advice would be to dive into it! As Marissa said, what you learn from your new projects will give you more seasoned eyes for your trunked project.
In the end, it's your decision, of course, and it's one you won't/shouldn't make until you are ready, but I thought I'd throw this out there because . . . been there, done that.
All the best,
Riv