Welcome here to the forum, a good idea, though with an anxiety condition it must have been hard to make that first post.
Having just about completed your masters says awful lot abut you, intelligence, self appliance and mental stamina stand out straight way.
Living at home has lots of advantages, however it can cause one to defer to parents overmuch. May I suggest that you do get some medical support for your anxiety condition? There is nothing wrong with telling your parents your end-of uni situation is worrying you overmuch and that you want to see a doctor. I'd be pretty certain they would understand even if they have not been in the same situations themselves.
I found my anxiety condition steadily worse until I had competent medical help.
Getting that support may help you in the next step towards employment. Although you at present do not feel confident in interviews I would think the friendly and and person-valued atmosphere of volunteering (yes, I know what you said) could suit you. Volunteering, to be pragmatic, helps on a CV and also quite often leads to paid work.
Just about all social assistance organizations are stretched at the moment , and you might be able to select one that has a position to suit you. Financial advice (after training), or if talking is not your forte perhaps a food bank, otherwise maybe sorting donations, the list is endless.
What do you think?