You're not likely to make money with a single ERJ.
When you start you've got a fair number of people sitting around in corporate that cost a lot of money to employ. You need to sell a lot of seats to pay for them. A single little plane makes that difficult, even with 2 or 3 you're not likely to be making much. I imagine when you check "My Aircraft" that your plane itself is making a gross profit... if not, you've got much bigger problems, but I imagine that's the case. It's the overhead that's killing you at this point.
Also, you don't necessarily want to be at the top of fleet utilization when you're running small planes, at least not just 1 of them. What that tells me is that you've got that little plane on probably a fairly long flight or two. The best way to make money with little planes like ERJs is to turn them, not keep them in the air. That means, if you can get a 45-minute flight, and spend 45-minutes on the ground turning around, and do that 5 times a day, that's great. Your utilization will suck, being only 50%, but your plane will make a LOT more money making 5 x 200-mile flights than it will making 2 x 700-mile ones, though the utilization on the longer flights will be much higher.