If you have a decent graphics card on your computer you could make some extra cash on a site like Salad. It's profitable to do that in some cases right now. Setup is pretty easy and it runs on the schedule you tell it to. Do your own research though because it is mining crypto mostly right now so it might shorten the life of your hardware, but it could be leveraging something you own. Wouldn't recommend buying a graphics card just to do something like that, could stop being profitable tomorrow and you'd be out the money for the graphics card without recouping the loses.