There may have been a power surge during the storm that damaged the router’s input power circuit on the motherboard.
You will need to open the router and check for any damage to the components.
Here’s the TP-Link Archer C7 Teardown guide which should help to gain access to the motherboard.
If you see any damage or are not quite sure, post some close up images of both sides of the motherboard, especially near where the power adapter plugs into, back here. Here’s how to do this. Adding images to an existing question.
If you get it working again it is advisable to connect it and any other household electronic and electrical equipment via a surge protector -example only to the mains power supply. At least it will be the only thing that may be damaged due to power surges etc. and not anything connected through it.
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