I think it is good to take a break now and then to refresh the creative mind. I have several other things to play with when I feel like I am making the same quilt over and over. Once I even took a year off quilts to learn and do all about bookbinding. I am back to quilting but I know that I have other things too....
altered books, paper crafting, writing short stories, embroidery, reading, bird watching.....mix it up and go with what your creativity tells you is most interesting in the moment. You will find you bring that joy back with you to the sewing machine.