Hi,
we came over on a 457. It is, in my opinion, a very insecure visa. My partner lost his job and we were given 28 days to find a new sponsor or leave Australia. Luckily he got a new sponsor. This has happened to s 3 times now. His last employer eventually sponsored us for Permanent residency and after a year with them, we were able to apply for citizenship. It has been a rocky, an expensive , road. My advice is to get your partners work to sponsor you and put in for PR ASAP. So you have more security. Good luck