Placing orthotics bellow your arches is very harmful in the long term. In general you shouldn’t prevent your foot doing what it is designed to do (big heel drops, fat soft shoe soles, orthotics) unless there is a problem (read injury) and only temporarily (until you recover). So are narrow toe-boxes in shoes, your toes should be able to move freely and naturally. If they can’t, the restriction will create irreversible (read: even surgery won’t completely fix what they cause) problems, that mess up all the bio-mechanics of the leg. I wish I knew this when I was younger, working 8-10-12 hour shifts (yeah, I know), as a waiter/barman.

Btw, it might sound counter-intuitive, but proper running, relaxed and a little each day (even as little as 10 minutes) can help getting your legs stronger, relieve stress, restore fascia (without stretching, static stretching never ever worked well for me) and keep it flexible and strong, reset nervous system firing patterns on your shoulders (moving your hands like you do in running with the proper form is way more effective than PT exercises like trap-3-raises for the traps) to counter balance the amount of time you spend looking down, help re-align your spine, and pretty much invigorate your whole body.

But most importantly, rest and eat well. This will be the defining factor on whether your body will adapt and get stronger or not, and how long it will need to do it. We are supposed to be standing all day (not facing downwards though), your feet shouldn’t be the issue here, your neck & shoulders are the part that is assuming the unnatural positions for extended periods of time, so as often as you can break them and do some gentle full range of motion movements (a.k.a dynamic stretching) the better.

Regardless, good luck with your new job! :-)