While we don’t have full facts here - it appears the ‘disclosure’ was nothing exceptional that rocked the nation. Every organisation has faults and how they rank in the scheme of things varies - for example an organisation might have a data breach or procurement issue but this is just a small slap on the wrist compared to some health and safety issue ...
Technically you appear to have been correct with your disclosure - but you might have used better judgement in your approach (on reflection at this stage).
unfortunately a lot of disclosures are not actually important or significant - but are related to some misjudged attempt to victimise or demonise a colleague or manager one has ‘fallen out with ‘ or one has a disagreement. We are all human - I fully understand we don’t see eye to eye all the time.
there are so many informal and formal channels available- including unions etc -
notwithstanding that we can’t know the full particulars of your case here - it might be time to reflect / let go - and move on. Learn from the experience. Most organisations are bigger than any of us, despite how important one might feel their role is. Look what happens when we get sick or die - someone new comes to our role and life goes on
family first always - work and career are second - in my humble view. And especially during the current world health crisis.