Unfortunately, you cannot delete your trade history. However, you can easily start fresh by creating a new trading bot. When you assign your subscription to this new trading bot, its trade history will begin from the moment it's created, effectively making your previous trade history no longer visible.
A convenient way to create a new bot is by cloning your existing one, especially if you want the new trading bot to have the same settings as your old bot.
If you want to start with a fresh trade history, creating a new trading bot or cloning your exciting trading bot are the best solutions.