"Having 10 years worth of salaries" is almost on the opposite side of spectrum than "without anything planned".
Money is obviously a great help, and saving money aside is a great hedge against future risks (so you can call it a plan).
I think that the OP had no “career” plan in mind. You can burn through all the money in the world if you are not careful.
But again, having money helps immensely whether you have a plan or not. If possible do put some aside for future emergencies or crises.
Money helps, but there are a huge number of other factors that are just as important. That is demonstrated by the number of answers here by people that quit without having money, and the variety of stories and outcomes.
I quit my job a few years back, and I believe I have the financial runway to do so, but I am still unsure if it was a good idea.
Not working is weird because most of my peer group works. I have found there are social costs to not working. I find that not working has other significant issues, even though I have had plenty of chance to learn mitigations (I have had multiple job sabbaticals in my life e.g. travelling when I had little money).
I would be happy to work again, if it were a job that invigorated me rather than slowly killing me. Our time is our most valuable asset, and every second our remaining balance diminishes.
There is a certain amount of mystical or wishful thinking while working, about quitting work and relaxing or refocusing for a while. I have found reality turns out to be more mundane.
It is still my ongoing choice not to work, but the consequences of that decision are not quite so clear cut.
COBRA is also an option for a limited amount of time after leaving.
Under https://www.coveredca.com/health/coverage-levels/bronze/hdhp... coverage for an individual 40 year old making $150K/year will cost you $6k/year with an out-of-pocket max of $7K/year. Not great on either end. But, not disaster either.
But, if your income is $30K/year, the cost drops to $0.0 to $1200 per year.
If I didn't have a child in school I'd be on a plane to the Caribbean so fast.
The qualifying income cap is based on you anticipated "Modified Adjusted Gross Income". They don't count assets. This means that if you may have losses that bring your income for the year down to the income limits, then you can honestly say that and get subsidies. If you currently don't have any income, but you can imagine yourself earning the minimum income in the calendar year, then you can claim that. (If you are lower than the minimum for ACA, you will get MediCal for free)
For example, in California, for a family of 4, if you can honestly estimate that after potential losses and potential earnings, your modified adjusted gross income would be between $39,750 - $53,000, you can get top tier coverage for ~ $5 a month, no co-pay, very low prescription costs.
If your situation changes (you start working again) you just notify the state and either pay a higher rate or cancel and use your new company's plan.
Search for "2022 ACA Income limits [your state]"
Here is the 2022 chart for California: https://www.coveredca.com/pdfs/FPL-chart.pdf