Building a Startup, but have a 6 figure offer at a bank (I will not promote)

Hi everyone! I am currently building/built a fintech startup with my cofounder, and we have a fully working product, have about 15 beta testers on and giving feedback, and have been working on this for about 6 months now. Money is starting to get tight and I just got a job opportunity at a bank for a pretty nice salary (6 figures). This job is a very good opportunity to work with an incredible mentor but there is no real path forward after this job. Should I stick with my startup and see it through? Is this job just a little nugget thats trying to throw me off from focusing on whats important? Let me know thoughts.