Sony Xperia L1 won't connect to home wifi

Good answer!

Great facts told (home wifi works) nobody every says that and bravo to you, nice.
so you do use proper credentials to log-in ,
SSID
WPA1
pass phrase?
or use PIN
or USing WPS? many modern devices now ban WPS and or PIN./
my new router has no PWS or worse PIN, it is deemed risky now..

no router told, is it under 10 years old? make model is what?
you do know very old routers fail on newer devices (and the reverse)
Xperia L1 means what oops a phone posted to PCs/
Sony Xperia L1 GSM cell phone fails. via
Wi-Fi 802.11 a/b/g/n, Wi-Fi Direct, hotspotas old as 2017 made, new, so 5 years max.
so is not old phone.
i just read you manual
and it covers WPS and PIN but fails to show normal
manual wifi setup, how lame is that?, for sure today.
example
in a real; phone or PC
we click find wifi in your area
and you see 10 more more SSIDs and you see yours pretending me is FIDO123. (only you know this)
so you click it and enter the passphase and it works.

problems are this.
your router does not allow wpa2. level and phone mandates it.
your router new has no WPS/PIN now. some ended only PIN use it is so dangerous.
or not knowing your wifi credentials at all.

what router is there, make and model
is it owned by your or the service provider
if not owned ask them for your credentials
if is owned you set them as you want. (settings inside router)