There could be a number of reasons why your Spotify playlist isn't playing. Here are a few troubleshooting steps you can take:

1. Check your internet connection: Spotify requires a stable internet connection to stream music. If you're having connectivity issues, it may prevent your playlist from playing. Try switching to a different network or moving closer to your router to see if that helps.

2. Restart the app: Sometimes, simply closing and reopening the app can fix minor glitches or bugs that might be preventing your playlist from playing.

3. Update the app: If you're using an outdated version of Spotify, it might be causing some issues. Check your app store to see if there are any updates available.

4. Clear the cache: Over time, Spotify stores temporary files that can sometimes cause issues. You can clear these from the app's settings.

5. Reinstall the app: If none of the above steps work, you might need to completely uninstall and then reinstall Spotify. This can help resolve any deeper issues with the app.

6. Check Spotify's status: If you're still having trouble, it's possible that Spotify's servers are down. You can check their social media accounts or a website like DownDetector to see if other users are experiencing similar issues.

Remember to back up any downloaded music if you decide to reinstall the app, as this process will delete it.