Rad runner plus 2nd model upgrade

[Starpascal]

Hello! to whom it may be possible to help me...

Here is my problem, not quite sure but it think my controller is dead. And it's mine since over 2 years so i think an upgrade would be appreciated. But i really don't know what im searching for to be honnest. I heard that every compoments have to match up in wattage but in dont know if that's true but would make sense but costly if done ( new controller, battery and motor bought at the same time.) But right now all i want is my bike to work without me « pedaling it »

So i need advice to choose wisely. My rad runner plus (second one) is still stock. Never made any changes on it. I saw some controller on amazon can someone tell me if that's ok or not before is make a wrong decision?

Here is few examples of what i'm looking
For:

[inoxa]

I have done this upgrade before.  It made a big difference in performance.
I purchased from area13.  see link.

https://area13ebikes.com/products/radkit

You have to get a controller and screen for this to work. 

also you can try electro bike world