Hi @Danielle_Jenkins Welcome to our Asana community forums in the link below you can find details on how to accomplish this task without losing any of your work someone had a similar question but in reverse 
How to switch personal email to business? - #2 by Ron_Sanga
To save you a click here are the steps:
- Go into your Asana “Settings” and Under “Account”
- Look under “Manage emails” from here you can add your personal email. Once completed make sure your personal is saved as your preferred email.
You can read more about how your Asana account works here https://help.asana.com/s/article/your-asana-account?language=en_US