Here to Rec this again, or The Right to Write also by Julia Cameron. It doesn’t necessarily help with line actual writing tips, but I found it helped my writing and creative practice in general by beginning to consider my entire life as a whole as part of it. What we write comes from how we live, what we see, how we think. And this helped me with that! It comes in from an “Artist’s block“ perspective, and I was worried it wouldn’t work because I wasn’t at all blocked, but I still found it really useful and interesting to discover the ways that maybe I was blocked and hadnt realised. It’s also just a really good tool to ensure commitment to craft, which i think is the hardest and most important thing in creating. If you do it a lot, consistently, you will improve, always.