If you've been making tech money then: leave whatever expensive-ass city you're living in, there are very few full-time artists who can afford to live in the San Francisco Bay any more. Work remotely in your tech job for a year or so, build up several years of runway, because going from "I guess I like to draw" to "I draw good enough that people are willing to pay me for my art, and enough of an audience that I can pay my rent doing this" is gonna take at least five years of it being your full-time job.

If you have a significant other who is also making tech money and is willing to keep doing it, this will be easier.

Get a Patreon or similar up as soon as possible. "Patreon paid for my drink at the artist meetup!" is a milestone worth celebrating as much as "Patreon paid all my bills this month with money to spare!".