If your account is on lemmy.world... sucks to suck. Hurry up and wait. Maybe ping their admins in and see if the database just rekt your account in particular and maybe they can fix it, but don't expect a response. Don't rely on single huge instances to ever be stable, lemmy is still a fledgling beta software!

If you're using accounts from a different instance and are trying to interact with communities on lemmy.world, use different (ideally smaller) instances that may not be generating so much federation traffic and will have a better chance of getting through.

I dont know what that "account not ready" error specifically means, i just know that lemmy.world has been dying more often than not.

Lemmy world is under persistent denial of service attack in recent weeks: https://lemmy.world/post/2923697

The admins are aware and responding daily, the technical specifics of the attack keep changing as they close off one avenue of attack, the attackers switch to a slightly different approach in a game of cat and mouse.

There's nothing you can do but wait, it will come back online... or use alts on other instances. Lemmy world has a competent admin team who is working hard to weather these attacks, but lemmy the software is not prepared for this kind of adversarial resource consumption so it's a very hard job to both layer protections on top of lemmy and also to fix underlying issues so it's natively more resilient.