You need to get in touch with a strata manager who is prepared to take over your scheme. Don’t even consider a strata manager who is not part of the Strata Community Australia but bear in mind that many strata management companies are not keen to deal with small schemes – same amount of hassle for less money.
You will need them to help you get your papers back from the previous manager whom you should dismiss on the grounds that a) their licence has expired and b) they have put your scheme in a position where it is in contravention of the Strata Act by not having insurance.
Finally, you need to report your strata manager to Fair Trading so that they can be dealt with at the highest level.