These are the tools I regularly use to organize my marketing:
✔️ Loomly is similar to Hootsuite or Buffer, in that you can create a single post and cross-publish to all your platforms. I've used multiple media schedulers, but let me tell you what I like about Loomly and why it's worth it to me:
I can create tags (like content buckets) to help keep my feed fresh and on topic.
I can add content to a content library if I know I want to post about it, but am not sure when.
It tells me when is the best day and time to post on specific platforms.
If I don't have images and such to go with a particular post, I can choose one from their library.
I can view my posts (and the tag/content bucket) each post belongs to on a calendar or in a list.
✔️ BookBrush lets me create book-related promotional images.
✔️ Canva, even the free version, is a fantastic, easy-to-use tool to create marketing images.
✔️ I download these images, then move them to one of two types of folders:
Marketing for general marketing images I may want to use again.
Story Name_Marketing, which is nestled inside the Story Name folder, for book-specific marketing items.