With 30 RX580s, you've got a solid setup for mining. You could look into Kaspa (KAS), it is becoming really popular among GPU miners because of its fast block times and efficiency.
There is no point in even indicating the hashrate of the video cards in these benchmarks.
https://hashrate.no/coins/KAS/benchmarksWith 5 cents per kilowatt the profit will be 1.5 dollars per day, and the problems will be much bigger. Even with free electricity of 4.5 dollars the profit per day will be very small.