Even a 491 visa is unfortunately not easy to obtain for engineers, how would you go about getting this visa? I have tried for over a year to obtain a 489/190/189 visa, but immigration requirements keep getting tougher. If you can get a 491 visa, then I don't think you will have a problem finding a job (does not need to be in your field), especially considering you are currently working in the UK in your field.
If you work for one year in NSW then you may be eligible for the 190 visa. https://www.industry.nsw.gov.au/live-and-work-in-nsw/visas-and-immigration/nsw-skilled-occupations-list/nsw-190-priority-skilled-occupation-list
Or if you can obtain a job offer in regional VIC then you also would be eligible for a 491. https://liveinmelbourne.vic.gov.au/migrate/skilled-migration-visas/491
Or look at Category 2 - 491 for Tasmania. Need 6 months work experience in the state, does not need to be in your field. https://www.migration.tas.gov.au/skilled_migrants/skilled_regional
Or for South Australia, if you find a job in your field and work for 12 mos Adelaide or 6 mos outside and have 3 yrs exp, eligible for a 491. https://www.migration.sa.gov.au/skilled-migrants/lists-of-state-nominated-occupations
Or you can go on your 476 and tell employers to give you a chance, and if they like you then they can sponsor you on a 482, 494, or 186 visa. https://immi.homeaffairs.gov.au/visas/getting-a-visa/visa-listing/temporary-skill-shortage-482 But all these visas have a levy that the employer would have to pay, which makes this route less likely.
Or, if you're single, find an australian partner, and apply for a partner visa after living together for a year. Don't do this for the sole purpose of getting a visa though, or you will be rejected and banned for years.