How's your social media going? At this point, I hope you're posting regularly! Don't forget to promote your events alongside adding in some touches of personal content to keep your friends and followers connected to you as a person in addition to you as an author!
If you're not all that into social media, check back on your website and Substack strategies! Make sure everything is updated and good to go. Do you have a plan/schedule for your next few newsletters? Make sure you're always including pre-order links for your book in every communication you send out!