Hmm… Google “top frameworks for JavaScript,” go get a book that teaches the hottest framework, and then demonstrate that knowledge by building something with it. Host on GitHub pages.

See if that framework has a local meetup group. Attend to network. Being associated with a meetup helps.

At that point, find a job posting or a recruiter looking for people who know that framework and try to land the gig.

In my experience, the barrier of entry of dramatically less for front end roles than other roles. Once you’re in, it’s easier to move away from front end if that’s what you want.

Be nice and enthusiastic in the interview to make an impression.

I think that’s the fastest way?

Warning: programming is challenging work and not everyone is cut out for it. It can be miserable work.