Using Chinese Family Visit (Q-2) to enter China in OCtober, 2021

I've been outside China since February, 2020 due to the coronavirus pandemic. I had two Moderna vaccines. What do I need to do to re-enter China? My multiple entry visa is/was valid until February, 2024. What do I need to do now to re-enter for a period of time? Is the visa still good? If not, will it be valid in future? Thank you.