Without specifics, you have 4 outcomes:
1. everything turns rosy and you're happy - stay
2. you get put on a performance improvement plan (or whatever Meta HR calls it) and you are Ok with it and improve - stay.
3. you bomb the PIP and are shown the door - shuffle off :-( or :-)
4. It's all too hard and you bail.
BTW the above applies pretty much everywhere. Believe it or not, Meta only exists to make the shareholders and top executives even richer.