Alonso going to AM is basically confirming Piastry is joining Alpine. he is a Renault contracted Driver and Otmar Safnau has confirmed he will have a seat for 2023 jsut not where...
that just leaves:
one seat at Alfa Romeo, will most likey be Zhou he is doing well.
one seat at Alpha Tauri, will most likely stay Tsunoda he is not doing too bad the car is.
the two Williams seats, that might become Piastry + Albon as well.
but who knows, we might get De Vries or the Hulk back.
I