Should I quit without a job in hand

Hi folks, I'm 23 (24 in Feb). Currently in an economic consulting firm as a Program Manager for last 18 months. Before that had 1 year experience in Founder's office of a Fintech startup.

I left my previous job because of the toxic culture, and joined the current job because economics was the only thing I knew apart from what I was initially doing back then and I just wanted to get out (current company is actually a firm that facilitates research and data initiatives for economic research centres and banks). I've hit a ceiling in my current role because most people here usually go ahead for a PhD or Masters abroad and I've realised in last 1.5 years that a full fledged academic career isn't for me and parts of what I enjoy working in this job (data, elements of stakeholde management, figuring things out and solving problems) are similar to what I did previously. Apart from that, in current job people usually stay around for 2 years or so and move ahead for further opportunities or PhD. So there's no real monetary or positional growth i can get here either.

Although, it is for some reason quite tough to switch back to another startup directly and I was wondering if staying in this job too long would skew my profile even further away from the business/product profile i initially had

I'm not in a money crunch but leaving without any job in hand feels very scary as I've not done this before

Any thoughts or suggestions on how to approach this would really help. Happy to give more context if needed