power cycle your router (turn it off wait 10 sec power it back on)
and/or
power cycle the switch (hold power button for 10-15 sec to turn off the system then turn it back on)
Does it at least show the available routers in the list?
I mean, is the WiFi chip even working, enough to show the available wifi networks to connect to?
Check the encryption method on your wireless security. Nintendo likes TKIP and apparently hates AES. I had to switch the encryption before my Switch could connect - it's lousy because the PS4 seems to hate TKIP and has shoddy connection, so now I had to buy an ethernet cable to connect the PS4 and still have my Switch connect to my router.
You've probably already tried this, but it hasn't been said:
Try moving absurdly close to your router. Or get away from aquariums, microwaves, computers, etc.
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