The Biggest mistake I have done and I'm sure others do is overthink and over pack well "STOP THAT" The thing is you can simplify down to toiletries and clothing first need some comfortable shoes 2-3 pairs of socks some pants and shirts a jacket sweats if needs be dress and skirts etc Basically in a nutshell pack for how long your staying and add a day so an extra shirt a pair of socks extra undies ETC
Electronics
Depending on what you will use Bring your tablet a Comfortable pair of noise canceling headphone Me personally I'd skip the AirPods and AirPods pros as they can easily get lost in the seats a lot of people like AirPods Max I Like the JLAB noise canceling good price has a bag and type c charging but also don't forget power banks as these do become very handy My goto will always be Anker I like the quality
PHOTOGRAPHY
Cameras I say choose a good camera "BUT" choose wisely Have a canon mirrorless for international with 2 different size lens and a canon Powershot for local but its just my taste everybody has a preference but I like Canon some like Nikon .I also do use Drones by DJI a good company but drones you can fly certain places so I would take a look where you can fly and last but not least action cams everyone knows GoPro and DJI Brand honestly preference again I use GoPro as my choice for everything I do I Like it I'm familiar with the system.