How to Handle the Suspension of an Account Used for Twitter API Integration

Due to changes in the specifications of Twitter's Developer Program, only one app is now allowed under the free plan. If you have multiple API accounts, they will be forcibly disabled (the API account status will be set to SUSPENDED).

Here is how to handle the situation:

1. Open https://apps.twitter.com/ (it will redirect to https://developer.twitter.com/en/portal/projects-and-apps).
2. Delete the unused STANDALONE APPS entries until only one remains.
3. Go to Products -> Twitter API v2.
4. Click on the Free tab.
5. Click the button that says "Downgrade to free access?" (Downgrade).