Regrettably, improving the lot of whistleblowers may be difficult to achieve legislatively or legally — even if a majority of the citizenry approves, the institutions will resist. It may be that the best way to make a difference is through NGOs like https://whistlebloweraid.org/# since at least they don't have to play by the rules of the organization. The US military may not be able to muster proper rewards for someone like Ian Fishback, but it can't stop a charity from at least disbursing aid.