Advice please

Hi guys, looking for some advice please...

I'm a UK National living in Perth, Australia. My ESTA got approved for travel to the US in March. Booked return flights a couple of days later. Then three weeks later, my ESTA got overturned and I'm now to be denied entry.

Incredibly frustrated as I can't get an appointment with Consulate in Perth to put my case forward for a Tourist Visa as there are zero appointments available for years apparently.

Really want to make this trip as it's for a very good friend's wedding.

Can anyone offer any advice?

Thanks!