Hello powers1996,
Welcome to Apple Support Communities! We understand you're having trouble retrieving your new emails. We're happy to assist you with this.
While in the Mail app inbox view, press the Command + Shift + N keys to refresh email accounts and attempt to get all new emails that may be waiting on the email servers.
Another way to check for new email is select “Mailbox” from the menu bar and choose “Get New Mail”.
You can also add the icon to check for new email in your Mail toolbar. Check out the fourth option in this article to see how: Customize toolbars on Mac
Best Regards.