法律上H1B失业后有60天grace period 60天内找到新的雇主可以file new I-129H form

60 Day Discretionary Grace PeriodIf H-1B employment ends before the end date on H-1B approval notice, scholars may qualify for a 60-day grace period (or until the H-1B end date, whichever is shorter) to: Secure a new employer to file an H-1B transfer (PORT) Apply for a change of status. Depart the United States.