Vyxal, 6 4 bytes

›ÞFẎḟ›

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-2 thanks to Deadcode

1 byte longer than it should be just because Vyxal's "Fibonacci sequence" builtin does not start with 0.

Vyxal, 6 4 bytes

ÞFḟ›

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-2 thanks to Deadcode

1 byte longer than it should be just because Vyxal's "Fibonacci sequence" builtin does not start with 0.

Vyxal, 6 bytes

›ÞFẎḟ›

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1 byte longer than it should be just because Vyxal's "Fibonacci sequence" builtin does not start with 0.

›ÞFẎḟ› # The program points to this comment, why I don't know
›      # 1 + the input
 ÞF    # Infinite list of Fibonacci numbers
   Ẏ   # Take the first 1 + the input elements
    ḟ  # Index of the input in the list
     › # And increment the result

Vyxal, 6 4 bytes

›ÞFẎḟ›

Try it Online!

-2 thanks to Deadcode

1 byte longer than it should be just because Vyxal's "Fibonacci sequence" builtin does not start with 0.