You have to be very careful with Amazon and follow the Amazon Terms of Use and policies related to web-scraping.

Amazon is quite good at banning IPs of the bots. You would have to tweak the DOWNLOAD_DELAY and CONCURRENT_REQUESTS to hit the website less often and be a good web-scraping citizen. And, you would need to rotate IP addresses (you may look into, for instance, crawlera) and user agents.