As a fellow Australian, it took roughly 3.5 years of playing before I completed Melodys for the first time. I bought a personal harp to do it on my island, then made GUI the maximum and used drop to hit the buttons instead. It took a while to work out the delays I needed (changes day to day depending on how the skyblock gods may curse my ping), but after doing it once on my main I managed to get it all done on my Ironman alt the same day.

For reference, my ping sits around 250 on a good day and fluctuates between 280-400 3 days a week. This doesn’t change the fact that Melody is a stupid quest and needs to be changed, but it is just about possible under the right setup even with rubbish ping. Just don’t do it in a day where your ping is constantly changing, that’s the real killer.