Great to see you on the forum. Connecting communities is so important. I am not sure what you mean by 'agencies you should contact'. Are you asking where you should share the details of the new Coronavirus Mental Health Support Service and what agencies you should tell across the country?
If it is, my first answer would be GP practices, universities, schools, TAFEs, childcare facilities like daycares where you have a lot of new parents and most importantly, hairdressers (this group are the Nations accidental counsellors).
I am not sure this is what you were looking for but I thought I would try,