Wǒ qùnián dé guo xīnguān, zhèngzhuàng búsuàn tài zhòng.
I had COVID last year - symptoms weren't too severe.
Tips
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新冠 is the everyday short form of 新型冠状病毒 (novel coronavirus). In writing you'll also see 新冠肺炎 (COVID pneumonia) and 新冠疫情 (the COVID pandemic/outbreak).
mistakes
Read 冠 as guān (first tone, 'crown') here - it refers to the crown-shaped spike protein. Don't read 冠 as guàn (fourth tone, 'champion / to crown'); that reading appears in 冠军 (guànjūn, champion).