Upgraded to gig plan, ethernet is blazing fast but wifi is very slow

Just upgraded to gig package with XB7 gateway.  When connected via ethernet I'm getting 800+mbps, but on wifi I'm only getting 80mbps on 2.4GHz and 50mbps on 5GHz.  Was on the phone yesterday with support and they verified that the router is recieiving the appropriate speed, but can't send in a technician due to COVID.  I understand that wifi will be slower than ethernet, but these numbers tell me something is wrong.  The results are the same regardless of device (phone, laptop, desktop, tv, etc.).  Speedtests done sitting next to router.  None of my devices will be used off the wifi network so the added cost isn't worth 80mbps.  Please help!