My wifi is greyed out. What can i do to fix this?

Is Low Power Mode ON?

If yes, go to Settings -> Battery -> Low Power Mode -> OFF.

Then you can turn on Wi-Fi.

The wifi chip is faulty. What i do is cool my phone like putting it in the fridge then charge it. When it comes on, i’ll play music to keep the phone awake so it won’t restart and greg out the wifi and bluetooth

this didn't work