My phone doesn't read my SIM card?

I have a huawei p30pro and my battery just went dead.

When I loaded it until it was 30 percent, I opened it again and then it no longer read my SIM card.

I cleaned the SIM slots and my SIM card and it still doesn't read. I was careful.

What could that be. I did some research on the internet but found no reasonable information.

Either your mobile phone or the SIM card is defective. Try your SIM card in another cell phone or insert your SIM card into another cell phone.