You can play around with this gear calculatorJust out of curiosity ,,,,,, what would changing the REAR wheel to 24 inch do,,,,,for speed
OK ,,, the big gear on the back cassette is 32t and the small one is 12t ,,, The set may be something like B2The answer on wheel diameter is the ratio of 24/20 or 1.20, That's 20% more speed for the same cadence. So 12 mph becomes 14.4 mph. Then you can fool with the other gears too, and use 14T/11T and 52T/46T as the other possible multipliers. Well I assumed your smallest gear is 14T, but it could be 12T.
HiIt weighs like a pedelec and I don't change the plate from 46 to 50 or 52 teeth.
I would change the rear wheel by a24 / 26 or 28 inches if mechanically it was possible and at first it is more critical the driving because you are higher off the ground.
if you increase the diameter to24 / 26 or 28 inches from the rear wheel you have to watch that you can pedal because the distance from the front to the ground is lowered.
unlock the speed to 45km / h, improve the cassette from 11-36 to 11-42 to improve my ability to climb hills.
From a mechanical point of view, it is a 20 x 1.5 inch wheel combined with a 46-tooth plate and an 11-tooth cassette for 25km / h. You need a cadence of 112 rpm per minute to 45km/h, with a24, 26,28-inch wheel that would be 102/90/80 rpm. if you could change the drive wheel of the mid drive ..... for a larger one it would help lower the rpm.50 nemtow drive-unit is short to 45km/h.