Your ebike is limited because it can legally be operated by anybody (including a child) without needing any kind of license. If you want to legally operate a faster electric two-wheeled vehicle, take the test to get a motorbike license.
I get up to multiples of that on a push bike every day. The kids that rip past me do too.
Despite what the other poster is saying, there's no law of physics that says speed can only be unlocked by licensing.
Everything else is simply a pedal assisted ride.
And a vehicle needs to offer pedal power to qualify for unlicensed use as an e-bike. Otherwise, it becomes a motorcycle and requires registration,