That bike above is a death trap. Those that spend their time hating e-bikes should hate gas conversions 10 billion times more. I won't even get started on what is probably a kid rock banner in the back...

In terms of brakes realize you bought a beach cruiser and consider you may not have the right bike for your area. Beach cruisers are all in the name. Short rides at the beach where it is pretty flat if not almost totally flat you aren't going at much speed but cruising. You could potentially add brakes but in the end the beach cruiser would be the wrong bike. Something like the Specialized Roll would make more sense if you want a more upright position but something you can actually practically ride around a city or hilly area.