Managing and keeping several social media accounts organized, let alone registering them all, is a job in itself. Luckily, you’re not alone, and many people have put together tools that help you manage all of them at once, so you aren’t hopping back and forth.

Hootsuite homepage.
Hootsuite is a good resource for exactly this. It turns multiple social media accounts into a single dashboard, allowing you to be more social, more consistent, and more protected. Getting started is free, but there are also paid business plans.
Additional Resources:
12 Time-saving tools for managing multiple social media accounts by Buffer Social.
Hootsuite basic tutorial:
Thanks to Paperstreet for the video!