I'm fully blind, and do the IT thing. Learn to use
$1 and you're good. Yes, doing on-site support for machines you don't own is probably closed to you, or at least really difficult. However, if you learn to use NVDA 99% of the time, you've got a huge advantage in accessibility testing. You can use NVDA the majority of the time, and then just glance at the screen to make sure NVDA isn't missing anything. Or if you do find that something is inaccessible, you sound like you have enough vision to tell how the task would be done visually, so you can then give feedback about how the website/app could be fixed to give screen-reader users similar productivity. Or you could do freelance website work. Or get a job as a technical writer. Or do support in an accessible call centre. Or write advertising copy. Or get into transcription. Get comfortable with a screen-reader, and then you can do most of the stuff you do now, just without straining your eyes looking at the screen.