Shimano Nexus 3 speed “stuck” after oil bath and reassembly

I'm so grateful for this subreddit omg, thank you!

So, I read in the user manual that the Shimono Nexus internal gear hub needs an oil bath once after three years and once a year after that.

Thinking in the framework of cars, where an oil change is something any user should know how to do and can do with a handful of tools and without hurting the car, I decided to take a crack at it despite previously having done nothing more difficult than changing a tire. This task is not like changing a cars oil! It is quite difficult actually!

While removing it, I accidentally let it drop out of the cassette 😔I know, it's so embarrassing. Worse yet, when picking it up I think I handled the axel unit and I worry I may have progressed the gears or something of the sort. I worry this might have put things out of whack?

I'm not sure. All I know is that after the oil bath, when I put it back together, it just froze up. When I peddle, the tire freezes and stops moving after a few rotations. For the few rotations where it does spin, there is a grinding noise and it does not progress gears when I shift

Any advice on getting everything rolling again would be really appreciated! I have a bikepacking trip next month that I'd really like to not cancel, and I don't have a lot of cash so can't take this in or replace it, I'm kind of on my own here