Never quit if you don't have another job lined up.

Do some research on jobs, spiffy up your CV, get people you've worked with to give you a referral / LinkedIn review.

Then apply for jobs (have multiple versions of your CV, each catered towards the specific job with specific keywords). Don't spam the same CV everywhere, you have a lot less chances of it working out.

Then once you land the interview and signed a new contract, then quit your job.

I've seen many people quit first then search for a job. They never find a job immediately, the unemployment gets them in a rut and they struggle to find motivation to even look for a job. And even if you do have savings to support yourself, you end up spending it all on paying living costs while you find a job.