Notice that each of these accounts has a consistent voice, tone, and style. Consistency is key to helping your followers understand what to expect from your brand, so they know why they should continue to follow you and what value they can get from your social accounts. It also helps keep your branding consistent even when you have multiple people working on your social team.
People respond to good imagery, fun videos, and some interesting podcasts once and awhile. Jazz up your content by using this type of media regularly. Your social media pages will look bland if all you post and share is text, so be sure to use other types of media to catch your audience's eye. This is also a great way to add a level of personality to your brand.