Accepted just means received for processing. Approved is a later step. The IRS is seriously backlogged due to all the new tax laws and extra stimulus filings, as well as unprocessed 2019 returns left over from the COVID shutdown. Lots of other folks are still waiting, so please continue to be patient. Also see:
Tax refund delay: As tax season heads into the home stretch, some taxpayers are still waiting on the IRS to finish 2019 - CBS News
The IRS is under serious stress — what does that mean for your refund? (msn.com)
What led to IRS backlog: ‘Thin workforce,’ new pandemic relief programs | Federal News Network