Elon says "Priority #1" is addressing the issue of posting child sexual exploitation content on Twitter. He has already made it far easier to report this content.

Here's a link to the article in the tweet he replied to:

https://www.tesmanian.com/blogs/tesmanian-blog/elon-musk-started-tackling-child-exploitation-on-twitter-after-years-of-the-platforms-passivity-under-the-previous-management

And a link to his reply:

https://twitter.com/elonmusk/status/1594548607243411456?s=20&t=ukqzMs0UxSCuLHIVNH8GxA