Superhuman
Acquiring new superhuman abilities requires narrative justification, but upgrading existing ones does not. All superhuman abilities must be biotic, low-tech, hi-tech, luck, or magic-based and cannot simply be talent.
For example, if you were a Mutant and wants to gain Telekinesis as an innate biotic power, you could do so but would just need a narrative explanation for why you gained that power later in life rather than developing it when you first gained your Mutant powers. It could be something as simple as "I had this power all along but was afraid to use it" or "my powers are still growing" or something complex like "I trained at the mystic academy of magic" or "exposure to the astral radiation has further mutated me".