Here's what the different possibilities mean:
* "Ser mi..." followed by a noun: This means "to be my..." For example:
* "Ser mi amigo" (to be my friend)
* "Ser mi casa" (to be my house)
* "Ser mi..." followed by a verb: This means "to be my..." followed by the verb.
* "Ser mi objetivo" (to be my goal)
* "Ser mi prioridad" (to be my priority)
* "Ser mi..." followed by an adjective: This means "to be my..." followed by the adjective.
* "Ser mi favorita" (to be my favorite)
* "Ser mi único" (to be my only one)
Let me know if you have a full sentence in mind. I can then give you a more accurate translation.