Huawei P20 lite small exclamation point when Wi-Fi icon, what to do?

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I've been using the Huawei P20 lite for about half a year and until recently, my Wi-Fi connection has always worked flawlessly. Until now. A few days ago there was suddenly a small exclamation point next to the WLAN symbol. I looked in the wireless settings and there was that I have no Internet access. Other Wi-Fi works perfectly, it's just my home, and even that went on until a few days ago…

I would be very much looking forward to an answer!

Su

Once with your router Wi-Fi and turn on again