If you've lost a playlist on Spotify, you can recover it by following these steps:

1. Log in to your account on the Spotify website.
2. Click on your profile picture in the top-right corner and select 'Account' from the dropdown menu.
3. In the menu on the left side, click on 'Recover playlists'.
4. Here, you should see a list of all your deleted playlists. Find the one you want to recover and click 'Restore'.
5. Go back to your Spotify app and you should see the restored playlist at the bottom of your playlist collection.

Remember, only the owner of the playlist can recover it. If the playlist was made by someone else, you won't be able to recover it this way.