Hi,
@shmoggy. My condolences.
I suggest moving slowly, keeping the job for at least a year, tracking expenses, and then analyzing your options.
I lost a parent a few years ago too. It's a much bigger feeling than anything that relates to money. Like you, I inherited an amount that put me at or near FIRE, depending on expenses. I had been thrifty before but not quite FIRE. I lost my job during the caretaking-before-death era and never really went back to work.
I still worry some about running out of money later. So if you like your job and it pays well (as it seems to do), I would view that as an easier option for securing your future than feeling the need to add jobs later. Three or four years where the entire income is saved would still increase your assets by about 30-35%, it looks like. That's a biiiiig safety layer! Meanwhile, if you don't have your expenses completely tracked, you don't really know whether you're FIRE or not. So track first, decide later.
For insurance, check into Obamacare (Affordable Care Act) terms. I suspect you would qualify for good insurance (say, a "Silver" plan) that is much cheaper after subsidy than you currently anticipate. I pay about $22/mo after subsidy, and that's with rates having gone up this year.
PS. For the savings account, in your shoes I'd consider putting it into Vanguard's LifeStrategy Growth Fund, abbreviated VASGX. It provides long term growth at a fairly low cost by maintaining a balance between stocks and bonds, domestic and international. The target is 80% stock, 20% bonds. To me that means if you ignore it for many years, it will grow pretty well. Realistically you should at some point take into account the investments that are in the IRAs, decide your desired asset allocation, and adjust your overall investments accordingly. But to me VASGX seems like a wise default option for the long term. A more bonds-heavy option, theoretically a bit safer in the short term, is the similar fund LifeStrategy Moderate Growth Fund (VSMGX). VSMGX works the same way but with a target of 60% stock, 40% bonds.
https://investor.vanguard.com/mutual-funds/profile/VASGXhttps://investor.vanguard.com/mutual-funds/profile/VSMGX