sry about that, here's a screen
beyond that I'm not sure there's any real way to say, I don't think there's a reliable way to say how much difficulty will increase/exchange rate will change etc.

lol I'm new to this as well, if I understand correctly price has usually gone up to match difficulty so hopefully it won't matter much
The estimate is safe as long as price keeps up with difficulty. So around $1.6k per month is reasonable.
If it doesn't, you have to adapt or quit mining. But I suspect your rig will make at least $1k, more if price will rise.