Have you thought about mining cryptocurrencies? This is quite a profitable business if you choose the right strategy. I mine bitcoin with whatsminer m30s 100t https://minery.io/hardware-store/whatsminer-m30s-100t/ . This is a mid range model. Daily income is about $5. The income is passive. Nothing needs to be done. Sometimes you have to reconfigure the equipment. But in general, nothing complicated. Electricity is cheap in my area. So it turns out to make money on crypto.