It will be 30 days tomorrow my return was accepted at IRS. No refund yet. It says you usually get it in 21 days. How do I find out if something is wrong?

TT gives you an estimated date, based on the IRS customary goal of 21 days. But it is taking longer this year, in part because of all the extra stimulus filings. And WMR has been erratic and unreliable.  Lots of folks are still waiting.