Echoing kleinbl00, had quiet a few tendon injuries recently. Been two months since my most recent knee tendon injury and I'm just now able to do the 30 minute walk to work without an inflamed ball on my knee. Wrists are especially annoying because you can't exactly not use them if that's your job. I went heavy on the ergonomics after damaging mine a few summers ago. Wavy keyboard, slanted / vertical mouses galor, and a stylus for the phone. Plus re-organizing my desks to avoid any edges pressing on my forearms. I'd be lying if I said the pain was completely gone even a year after the ergonomic upgrades. No laptop at the coffee shop. But the wrists are functional / able to work full days at the computer again.
I found that switching to a mechanical keyboard was not only a joy because of the clickyness but also a noticeable improvement in how long I can type without strain. Now I'm too fond of it to ever switch it out for a wavy keyboard. A while ago I tried to add a Wacom tablet as a mouse replacement, as it has worked wonders for some people after you get used to the display locations being mirrored on the tablet. However, I get more RSI from thin pens / styluses than anything else because I use too much force to hold pens. Good thing I kept the receipt on that one.
Never tried an ergonomic + mechanical keyboard so your mileage may vary. I will say that I feel the same thing on styluses pressing on hard screens, made ~10x worse with fingers on hard screens, fingers on touchpads, and fingers on low depth keyboards (a la mac keyboards). Something about the backpressure just makes the tendons inflamed lightning fast. Vertical mice did wonders for me though. Let me know if you find a better solution, keyboards and mice are mostly a solved problem for me, but hard glass screens and stiff buttons are still my Achilles heel so to speak.
Does your phone have haptic feedback? As in, it vibrates a bit when you type/press things. The main reason most people press too hard is because they want to make sure their press registers. With haptic feedback enabled it's easier to teach yourself to tap lighter on smartphones/tablets.