@OP
At 53$ a card, that was clearly dirt cheap. I'm not sure I would have pulled the trigger, but you seem like you played the trading card well.
I always enjoy looking at other people's farms and rigs.
However if I'm honest, I do kinda see the end of GPU mining coming relatively soon, it no longer makes that much sense to me. Profits are small if not negative...especially with global warming, no one can ignore the fact that running huge farms is just bad for everyone at this point.
That said, I still mine to this day, most of my gear was purchased in 2016/2017. I personally still run about 40 of those sapphire cards (mix of 470/570s) at home in a dedicated room, but strictly on solar power. I developed my own script that monitors what my solar inverted is putting out and turns rigs on and off depending on how many kW I produce. It's been working super well for the past 9 months. I make about 4-5$ a day with 0 electricity costs related to mining.
Good luck with your operation.