Try to get 4 more cards you can make money around 300 to 350 USD per month.
I kinda have free electricity, some of my stuff the solar panel system take care of (and that includes my PC) that's why I'm not worried in how much electricity my PC will take.
Don't plan on getting more cards since that will require me to get an entire new rig specialized for mining.
I'm just going to use my current PC for now since it would be my first time mining, if this goes well I might consider getting a entire rig for mining.