Have you applied an overclock to your SD card?
Using dtoverlay=sdhost,overclock_50=100 will disable your WiFi.
Replace this with dtoverlay=sdtweak,overclock_50=100and your WiFi will come back to life.
Alternatively, if your home network is on a channel greater than 11 you will need to enter your raspi-config (sudo raspi-config) and change your WiFi region to something like GB where these additional channels are supported.