Pathways to PR? (subclass 462)

Hello, im gonna start by putting you in perspective:

I just arrived in Sydney with a friend, currently holding a 462 visa (Working Holiday), that we're planning to extend after our first year expires. We've already done 4 months of farm hand + 1 month travelling in Asia, which means our 1st year visa will expire on November 1st. My question is: what ways are there for us to stay longer in Australia? We're recent graduates in Business Administration (me) and Industrial Design (My friend), but we can't seem to find any jobs in our fields due to the nature of our visa.

We are currently going to start working in Construction or Hospitality since that seems easier to work at from the beginning and because it is good money, but we don't want to do that for the full length of our visas, and we would like to do something related to our fields. Is it that hard to get a job in those fields, and also to get sponsored? I've applied to hundreds of jobs and gotten 0 interviews. What can we do? We would love to stay here longer than 2 years but it seems impossible. Is there another type of visa that we could apply afterwards? or is sponsorship the only way?