Since it's been more than 21 days that you've filed your return, you can reach out to the IRS for further assistance. Here's how you can contact them: https://ttlc.intuit.com/community/refund-status/help/what-if-my-irs-refund-is-taking-longer-than-21-days/00/26080
Also, for more information about your delayed refund, see: https://ttlc.intuit.com/community/refund-status/help/some-federal-refunds-will-be-delayed-due-to-the-path-act/00/26970