Your host family dismissed you? Your au pair wants to leave earlier than planned? You can't sort out continuing problems and want to leave your host family? You can't sort out continuing problems and want to dismiss your au pair?
In both cases you need a new host family / au pair - fast.
As an au pair, you can simply adopt your search criteria in MY MATCHING (make also sure that your current address is right, so that families can see that you already live in the host country!) and find matching host families in the matching results.
As a host family, you now basically have two options: Search for an au pair who
is already in your country and searches for a new family ("rematch")
can come to your country without a visa and is available right away (this is especially possible inside EU/EEA/CH)