This error usually happens when Steam detects too many requests coming from your account in a short period, possibly due to rapid actions like refreshing inventory or browsing the store. It can last anywhere from a few hours to a day, depending on the frequency of your actions. Try waiting 24 hours and avoid making multiple requests in a short time. If it persists, check your internet connection or try a VPN, as some regions can experience temporary restrictions.

Hey bro! This only happens to people who use the market a lot. But a few months ago, the problem escalated to the point where it seemed like a bug. The error starts almost every day at the same time and ends at the same time, for everyone. Whether you use a PC or not. The error starts around 2:00 AM UTC and is fixed at 10:00 AM UTC, EVERY day, for months. It seems like someone has it under control. Because later on during the day it happens, but much less often and only if you use the market. I think someone knows that VALVE sleeps at night and takes advantage of it to use the market in peace. It took months, even more than a year, to fix the market bug where when you searched for something, an error appeared. I wouldn't be surprised if this error took years to be fixed. It's extremely annoying, but all we can do is wait for it to be fixed

As they other already point out.

+ what this user do, you need to know how you access it and how frequent you do it.
https://psteamcommunity.yuanyoumao.com/discussions/forum/1/669472405704804019/