Obtain a new securite sociale for my visa renewal

Hello, Sorry also for writing in English. Is there any chance you could help me about my situation. I was an Au pair in 2019 (1 year). Unfortunately, my hosts Family didn't help me to get a "Securite Sociale" and a "Carte Vitale" which I also do not know about. After a year with them I decided to find a declared job as a Nanny (with other Family). My visa that time already expired and I cannot apply for the Social Secuite or Carte Vitale anymore. I tried to applied in (AME) but unfortunately it was denied due to over minumum salary needed. These past years I was always sick due to covid (always need to do a test), cold, buying medicines and need to go to a Kinesiologue due to back pain. And unfortunately I cannot pay all the expenses needed. So by any chance is there any way to apply for the said Securite Sociale or Carte Vitale?