¡It's settled, JB Weld it is, then!

Which Cyrusher model was it?

As others have said, it is fucked beyond repair. From how it broke, I'm guessing it is stress from heavy loads and impacts on the rear wheel. It didn't happen in one go, aluminium fatigues over time, and eventually fails. All aluminium frames are eventually susceptible to this, but it more common on cheap chinese bikes with fat tyres. Those bikes are made to price point. They typically aren't engineered quite the same as more classical brands. There can also be more issues with the aluminium alloys. Most importantly, a fat tyre and a heavy bike puts a heavy strain on that kind of rear suspension.

In my humble opinion, 4" tyres and rear suspension doesn't make much sense anyway, even more so when you add a rear wheel motor The rear wheel is just to heavy to allow the suspension to work properly. If you add a rack and luggage on top of that, then I can see how those frame break quickly. On terrain where a fat tyre is good, like loose soil, sand, snow, you don't need rear suspension. For commuting on pavement, you also don't need rear suspension. It's unecessary weight and maintenance, and a hardtail makes a much stronger frame. I'd argue you don't even need 4" tyres, but that's your choice.

I'd recommend selling your bike for parts and treating yourself to a nicer new bike. If you're riding it hard enough to break a frame, it proves that cheap chinese bikes won't cut it for you.

Go try bikes in your local bike shops!