How long do we try before calling it quits ?

Happy New Year startup founders! I left a high paying job around last year to go full time into my startup. It has been around a year. We did not receive a funding yet and are still struggling to generate revenue. The new year 2025 hit me though as I had been one of my lowest state in the last few years. I have been an overachiever at my previous jobs with quick promotions and great paychecks, but the huge ambiguity of entrepreneurship might be too much for me. I don't want to sound like a hopeless person, but I am having the fomo of quitting my job and earning no salary for a year. My plan is to give a full throttle push for a few more months and if it does not work out, come back to corporate. OTOH, I am also going through the emotion that maybe if I have tried so far, why not try a little longer and see where it goes. The outcome/reward would be really exponential and way beyond what I can ever get in my job. How do folks here deal through such feelings ?