after 17.4.1 updated on my iphone 12 pro max,i no longer can connect to my wifi. please help.

Try and see if a forced restart will help

1. Press and quickly release the volume up button.
2. Press and quickly release the volume down button.
3. Press and hold the side button.
4. When the Apple logo appears, release the side button.

If you also face problems with your cellular connection you want to see if you need to install a carrier settings update

1. Make sure that your device is connected to Wi-Fi or a cellular network.
2. Tap Settings > General > About.
3. Follow the onscreen instructions to install your carrier update.