It’s most likely your crawl rate is too high and you are triggering our anti-DDoS protection.
The bot needs to respect the standard crawl-delay set in robots.txt for all sites.
Even then, I would suggest maybe crawling at half that speed, and ensuring that the bot does not break the limit not just in terms of rate but also in terms of simultaneous requests.
To get your IP unblocked, you will need to open a ticket, and the support team will provide a standard agreement you need to consent to in order to have crawling access re-enabled.
Bear in mind the entire system is automated and we cannot allow exceptions for platform-wide performance reasons. If the crawl limits are exceeded again, even if you previously had access reinstated, you will be automatically blocked again.