The first step you should take is to enable auto-fill for your personal information. With this, the bot will not have to enter the data that your browser will populate automatically.
Next, you should use sneaker proxies, preferably from the region where you want to make the purchase from. Another thing to keep in mind is that it is recommended to run the bot from a decent machine. Since the bot will be using the computing power of your CPU to carry out its tasks, it is essential to run it on a computer that can handle it.