gave you the simple, correct, answer - I didn't elaborate if you want to discuss it.

But the fact is that if you analyze the sentence:

“My life serves a purpose in some larger plan. I don’t know all the details; I can’t foresee every aspect of the final goal. But ultimately I know there is a reason for my existence that transcends this reality.”

Logically ( see logical positivism, Ayer etc) you find that the sentence is, literally, NON-sense.

Meaning that it makes no statement or assertion which can be examined to decide if it is true or false