Accounts that use consistent colour palettes and go the extra mile planning their feed will get followers on Instagram more quickly than those who don’t! If you decide to go with 12 initial posts, I’d suggest posting them within 2-3 days at least.
What happens after 10k followers on Instagram?
Once you have 10k followers, Instagram will make it easier for you to get people to your website via Stories with the swipe up to link feature. Swipe up is the only way to get a direct link from your Instagram to your other web properties. And, it’s available in STORIES, if you have 10k followers.