GRVPHON dell M6800 laptop wifi card upgrade

There won't be a Dell card this system can use -- it uses the older mini-PCIe form factor, not the now universal M.2/NGFF form factor.  You can still find older Intel (and other) cards that will support 5 GHz connections, but if you want one that supports Wifi 6, the pickings are much slimmer -- Intel doesn't make mini PCIe Wifi 6 cards.  Other manufacturers do.

https://www.amazon.com/MPE-AX3000H-802-11ac-Wireless-Express-Network/dp/B091FJXQHH