The Best self planner helped me write a whole book - 149k words - in one month. And nearly half a million words in less than a year.
Full disclosure: I love this planner so much that I became an affiliate. If you do decide to snag a Best Self for your best self, then here is my personal link.
I love this baby SO MUCH. I encourage all my writer friends, students, and clients to get this. A planner is a personal choice, so you have to choose the one that's right for you (I used to be really into the Passion Planner, which is also great, but made me hustle too hard). This one is based in positive psych, so it has a combo of healthy goal setting with opportunity for daily reflection, gratitude both morning and evening, as well as a quote, and hourly schedule. It's quarterly, which is super helpful for reaching your writing goals. It breaks things down so they feel attainable. I feel a lot less overwhelmed with it. It's really amazing (and pretty!). Check out the website for a free download to try it before you buy it. Let me know if you have questions!