The job that helps one "thrive" while being an artist.
In her vlog "Helenna's Tinseltown Tuesdays," Helenna Santos explains that actors/musicians/writers/artists etc... usually need a
"survival" job to bring in money while they are working on their craft, but Helenna finds the world "survive" to be negative. Because her waitressing job is what allows her to keep pursuing acting, she says that it's the job that helps her "thrive" as an artist. Hence, "thrival" job.
going to work as a waitress which is your "thrival job" to pay the bills so that you can take an acting class