Back up

I just bought a new IPhone, ( my last one I dropped in water)and I don’t find any year from 2017 till 2020 , and between this years I had also IPhone and I didn’t had problems with that before , I had just IPhone all my life, but now I don’t found nothing , pictures, phone numbers and I also pay monthly for ICloud , I found things from 2017 ...

Can you tell me how I can get back all this years please!??

Thank you very much!