I’ve struggled with hand injuries myself. If you are patient and willing to do some calls / screen sharing and work with me, I’m happy to spend some of my free time with you to see if we can build a workflow for you that enables you to be productive with only one hand.
Custom foot pedals, voice to text, mouse with left hand.
Here's a thread on setting up pedals for keyboard input. https://www.reddit.com/r/PUBATTLEGROUNDS/comments/9q4rph/hea...
Glad to hear you are fine now. That's the important thing.
Your audience would be other people in a similar situation.
Communicate stuff of interest to your audience, get a slab of money from google.
For fun I changed my keyboard layout to something exotic and felt really handicapped at first (totally self inflicted, and not comparable at all to what you go through mentally). It's OKish after a month, and now I type faster than I ever typed on qwerty.
Mouse:
I think with 30 your brain will adapt very well to your left hand. If it's too weak maybe the fingers can do more work so a trackball or something could work. The switch to the left hand is a brainfuck anyways so it doesn't matter if you also change the device, just settle on one quickly.
If hand/arm are alright, but fingers weak: click with something else (e.g. your foot). I can research or build hardware for that. (cheapest solution: remove all but one key from a keyboard and use a tool to map that key to click)
Keyboard:
The most common fix I think is having a modifier to "mirror" the keyboard. E.g. when you hold space and press a button on the left side of the keyboard it will register the key that is on the right side of the keyboard. There is scripts for this readily available, just let me know if mac or PC and I can find one for you (or you google).
Editing:
For editing you'll need shortcuts. You could either try to change them or find a mouse that has a few more programmable buttons. If neither works you can probably script something.
If everything fails I'll build you bunch of stomp-pedals for the feet that register as a keyboard (like guitarists have; just for shortcuts, not for typing).
https://docs.google.com/spreadsheets/d/1JfNAbUX_lN9K3MCNHO15...
Potentially of interest:
r/gigworks
r/workingonline
r/freelance
It's trite, but I'll say it anyway: dont focus on the things you cant do, focus on the things you can. That can include "working out how to do the old things again now that its harder".
Good luck