If you’re using Mastodon through your server’s website or the web app, you can optionally have it ask you for confirmation before unfollowing, deleting or boosting a post:
- Log in through your server’s website or web app
- Click on ⚙️ Preferences
- Scroll down to the section marked Confirmation dialogues
- Tick the boxes for the things you want Mastodon to ask confirmation for
- Click Save Changes at the bottom of the screen
The mobile apps may also have similar settings, but it will vary from app to app. Click on your app’s settings page to see if it has these options.