It's definitely a personal choice.
Using the examples other people have mentioned: living on 20k with 90k income and 20k on 45k. The first example gets you FI in less than 7 years. The second in 14 years, plus school time, assuming you have nothing now.
I am 8 years into my career, and honestly, there are few careers I would enjoy more than this one. But with just 8 years, it feels like a grind. So, even if the new career is perfect for you, it will get tiring eventually. Having to work 8 hours a day, 5 days a week, feels constraining, no matter what the job. For me a job change will help a lot, but keeping busy outside of work helps the most.
If you hate the career, you can move on. If it's just discomfort, you'll find it in any career. Acknowledge it, and push yourself to overcome.