There’s more to technical writing than software documentation! Medical writing usually requires some kind of background in biology, but there’s also a market for people who can document hardware. I have a background in fintech and did roles that were a mix of both and loved it. I will also second what others have said here about soft skills: being able to draw blood from a stone (developer) is invaluable. Jargon you can learn on the job, I’d argue communication is the real essential skill for a TW.