YES. A thousand times yes!!
Here’s the thing– you’re going to write more books, so you’ll need a central place on the internet (ideally yourfirstnamelastname.com) where your fans can find you, see all of your books, sign up for your mailing list, and/ or follow you on the various social media platforms. You need to start building up your audience as soon as possible, because each fan that you gain gets you one step closer to being able to write full time.