I have the same bike.First of all you should make sure your bike was originally set by a Specialized dealer to American spec which is 20mph (32km/h) limit and not the EU spec of 25km/h. Secondly, I understand that from 2019 onwards the bikes are locked by Specialized so that BLevo can no longer reset the in-built speed limits and, even if you could do it, it is not recommended as it would invalidate the manufacturer's warranty of 4 years on motor and battery. You might need this - I have a 2019 Turbo Levo Expert and I am on my 4th motor already! (All replaced free under warranty).

I have heard of people maxing out the wheel circumference setting to get more speed, but then I assume that not only your speed but your distance readings would be wrong too. Also, it is already a 29er, so I imagine that pretending you have bigger tyres won't make too much difference - certainly not an extra 25% speed. Maybe someone else who as tried this can comment?

I have found that the best solution is to ride with BLevo in Heart Rate mode. This adjusts the boost automatically when in Eco or Trail (but not in Turbo) to try to keep your Heart Rate in your selected range, and critically, it does not not shut off the power "hard" at 32km/h but tapers it. So when I want max speed, I ride in Heart Rate mode but select Turbo (100% boost) so that it does not vary the power but it DOES still taper gradually down from 32km/h until it gets to zero boost at about 38Km/h (almost 24mph). I find this significantly better than a hard stop at 32km/h.