Make it easy to buy your thing.
Make it hard to forget.
Nearly every social media post, include a link to pre-order / pre-save / buy your thing.
Nearly every social media post, pound it into people’s heads when your release is coming out.
At least every other day.
Don’t worry about looking spammy.
Hell, the social media algorithms prevent 60% of your posts from being see anyways.
Include the important stuff in as many posts as you can. Give yourself a chance.