Twitter now seems to be limiting the number of tweets you can send (if you're not paying Musk, maybe)?
Or maybe this is something else?
Twitter has always had limits on how many tweets you could post in a day, but it was always very, very high.
https://help.twitter.com/en/rules-and-policies/twitter-limits
Understanding Twitter limits | Twitter Help
Learn about account limits for things like API, updates, messages, and following, and find out why limits are used.