The feed into (most)panels is aluminum wire.
Aluminum is not the problem, per se.
Simply changing the amperage of a breaker, up or down,does not guarantee appropriate protection for the circuit; the AWG must match accordingly i.e; 12/2 or 14/2, etc.
As far as GFCI protection(wet location), everything downstream from a GFCI receptacle is thusly protected. Redundant installation can interfere with that.
Arc fault protection may be more appropriate to your needs.
Disclaimer: I am not a pro electrician, but am in the industry. Your local codes prevail.
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