Just restore. Note that only deleted songs in the last month can be restored.

1. Click to open the QQ music software on your mobile phone.

2. Log in to your account and click the "Like" playlist here.

3. Go to the "I like" playlist and click on the top right corner.

4. click "restore playlist" in the pop-up prompt.

5. Then click "I like it".

6. Enter the resume playlist.

7. Select the song you want to restore, and then click Restore.

8. Just recover.