After seeing AOC's post I feel Twitter should be banned. Until that happens there are things we can do that are simple and effective:

For people who have a Twitter account:

• Switch to Bluesky and make a Tweet saying you are now on Bluesky and no longer post on Twitter. Note that per Furball's comment if you use the word Bluesky in your Tweet it will be hidden. Be sure to censor the word or use a screenshot.
• If you have no choice but to use Twitter install an adblocker such as uBlock Origin. Also review your privacy settings.
• Leave a 1 star review on the app store for the "X" (Twitter) app.

Things everyone can do even if you don't have a Twitter account:

• Help your friends who are still on Twitter migrate away.
• Urge companies, governments, organizations, celebrities and other large accounts to make a Bluesky account and phase out the use of Twitter. They can start by posting on both to make the migration easier.
• If you're writing an article or posting on Lemmy, Reddit or other websites prefer linking and screenshooting Twitter alternatives such as Bluesky, Mastodon and Threads instead of Twitter when possible. This is also good for your readers because Twitter makes it hard to read Tweets without logging in.
• Contact people in your government and urge Twitter be banned.