Look like you've got some decent suggestions here already for pannier bags but I'd recommend:

-Feed bag instead of a water bottle holder: They can carry anything, not just water bottles, and you can just all sorts of different bottles. Since they're soft fabric, they don't get damage if you bump them hard or something hits them.

-Cameras would definitely be a good idea, I like 360 cameras because you don't have to aim them (I have an insta360 x5, which has replaceable lenses).

-Repair kit, patch kit, and an IFAK are all good things to carry. Might want to pick up some tire levers too, Pedros are good. You'll want a spare tube or two as well as a pump (I like Topeak Morphs).

Adding reflective tape and additional front/rear flashing lights as well as a full face helmet, padded, gloves, and eye protection would also be smart. First aid training, stop the bleed training, and driving school would also be strongly recommended if you don't already have that training.

Ride defensively and assume that nobody can see you when you're riding, drivers can be very dangerous. Also be sure to ride respectfully, don't ride fast on footpaths, dismount or go around if you encounter a crowd, and just don't be an asshole because that's how e-bikes get banned from places.

Good luck and have fun, having an e-bike can be a game changer.

By the way, I featured your post so it will stay at the top for a while and get you more answers.