IANAL etc... You are correct that out-of-work is a very bad place to be as an H1B holder. But USCIS allows you to interview for a different job, apply for visa

IANAL etc... You are correct that out-of-work is a very bad place to be as an H1B holder. But USCIS allows you to interview for a different job, apply for visa transfer to the new company and quit the old company after the visa transfer is approved.