1. If you're a brick-and-mortar business, make sure your address is in your bio. If you need people to walk in the door, it has to be easy for them to find you.
2. If you're using your account for business, do not set it to private, especially if it has your company name on it, or is linked to your work email. Instagram now makes it really easy to toggle among different accounts, so you no longer need to log in and out every time you want to switch. You can have private account linked to your personal email address, and a separate public one for work.
3. Watch the hashtags. Never use more than three, and it's even better to use only one.