Use your processor to mine, while your gpu’s are mining. Verus coin should be the most profitable at this time, but I can’t guarantee that, so please do your own research. If you have a lot of hard drive space, then you might consider building a rig for CHIA farming. Be warned, in order to master CHIA farming, it takes a HELL of a lot of work unless you are already work in IT and know networking, data management, programming, IT security, etc. But if you just want to farm a hard drive or 2, you should be just fine.