Ask HN: How to become a 'Domain Expert' as a programmer?

I'm coming from several years of Development experience, followed by a couple years of Cloud Operations experience. I haven't learned anything about any of the businesses I've worked for, and kinda feel like a commodity.

I've become somewhat by being purely focused on technology. How would I turn from a 'generic backend programmer' into a 'biotech expert who also programs', for example? I'd like to turn my job less into writing code and more into solving business problems, and possibly write the code as well.