Here are some other expressions, depending on the context:
* "Muchísimas gracias": "Thank you very much" (more formal)
* "Gracias de corazón": "Thank you from the heart" (more heartfelt)
* "Gracias por todo": "Thank you for everything"
* "Te agradezco mucho": "I appreciate you a lot" (more formal)
* "Te lo agradezco": "I thank you for it" (more specific)
You can also use informal expressions like "Gracias, man", "Gracias, mi amor", etc., depending on your relationship with the person you're thanking.
Remember that Cuban Spanish has its own regional variations, so you might hear different ways of saying "thank you" depending on where you are in Cuba.