The mods & the ceramic coating don't really add any value; they should help shift it a bit faster, but buyers tend to see that stuff as proof a car's been driven harder than a standard one.
Also, was it first registered in Feb 2019 or was that when you bought it? Because warranty depends on first reg, not when you bought it (I only say this because a lot of cars have been registered as demos & then not actually driven - which means they're new from a wear-and-tear point of view, but warranty is from first registration). I'm not sure if that extra ~18 months warranty adds a heap in this instance, however, as Holden's considered "dead" by most (eg. people thinking there's nobody to honour the warranty).
Prices are crazy at the moment. I don't know. If it were me, I'd be tempted to shoot for ~$57k in the first instance, as there are a couple of reasonable looking cars on CarSales for $52k & $54k asks at the moment, I actually checked the $54k one wasn't yours as it's the same colour & wheels & mileage (but it's in Victoria). Actually, maybe make that $55k, it might scare buyers away otherwise.
