My solution, from years of living out of a suitcase traveling for work, was “everything has a place”.
Need a pen? It’s in the first pocket of the backpack. When done, it goes back there. Need a charging cable, in the zipper pouch on the outside. When I unplug it, it only goes back there - no where else.
The other that helps when it comes to leaving stuff behind in a hotel room is a designated space - say on the desk. Anything removed from baggage - clothes, pens, computer, passport - doesn’t go anywhere but the desk. Then when you need to leave the room, you don’t need to search the room, only clear the desk.
At one point I put the RFID card I use to access the building i work at into the left pocket of my jacket instead of right pocket. I don't remember why but that day I was thoroughly convinced I forgot it at home. During lunchtime break I went back to my home only to find out it's not there...
Since then I keep the card in my left pocket.
The advice of having a specific place for every thing is good, but sometimes you mess up. I think I have ADHD so most of the time I don't pay any attention to where I leave things, I guess developing good habits is good whatever that is. Putting things in specific places is I guess one of such habits
Need a pen? It’s in the first pocket of the backpack. When done, it goes back there. Need a charging cable, in the zipper pouch on the outside. When I unplug it, it only goes back there - no where else.
The other that helps when it comes to leaving stuff behind in a hotel room is a designated space - say on the desk. Anything removed from baggage - clothes, pens, computer, passport - doesn’t go anywhere but the desk. Then when you need to leave the room, you don’t need to search the room, only clear the desk.