Can you get more wattage from a Bosch power pack 500?

Hi!
Ive got the latest model of Bosch performance line cx (2018) with a SB2 chip installd, and my problem is that I am not happy with just 50km/h on the flat. So I wonder what I can do with the battery system to get more power out of it so I can reach a higher top speed? Any suggestions of what I can tinker with to make it faster?
Sorry for my spelling I am from Sweden

I like the sounds of 50k as my hub motor ebike does about 40k
In your case using a mid drive I would change the gearing to suit my riding preference. Gear it for speed / the road or for dirt a comprise between the two might be more useful. Try out the ebike.ca motor calculator or what ever works for you and Sheldon Browns gear calculator to get a sense of speed gained.