Has your lifestyle actually expanded to consume 300k/year? If so, what is your lifestyle like?
Maybe you could work 1 more year, living off of 50k post taxes (which is already considerably more than most in the US make post-tax) and save the difference. Then, you can quit being confident that you can control your spending enough to take a job with merely good as opposed to extravagant compensation!
I think trying out the lifestyle/budget that you would expect is good advice.
At the same time you would be building up a financial buffer.
If you're already spending below your means then you may want to contemplate what value money has to you and/or what you want out of it in the long run. Maybe it's a social status thing, maybe you have practical goals like buying/paying off a house.
A financial plan can help to see what you need/want and how much money/stocks etc. your saving without the intent to spend it. To me personally if I have money that I don't see myself spending it's value (my personal evaluation) goes down significantly.
For example: I earn significantly less than $100k a year. Doesnt stop me from spending $200 on a dinner for two at a french restaurant. I can't do this every week - but I wouldnt want to. That wouldnt feel special. These $200 are above my usual expenditures and would potentially be over $1000 when I retire if invested properly... and yet I believe it's worth it.
Maybe you could work 1 more year, living off of 50k post taxes (which is already considerably more than most in the US make post-tax) and save the difference. Then, you can quit being confident that you can control your spending enough to take a job with merely good as opposed to extravagant compensation!