Some key advantages making this problem simpler are your low $24k spend rate, lack of need to leave an inheritance, and your age of 58 years. If you were 30 spending $70k per year with a young child the solution wouldn't be as clear, IMO.
Here's my suggestion:
According to ImmediateAnnuities.com, a 58 year old female(?) in Tennessee (randomly selected ACA state where one might be tempted to cross the border for big city medical care) can obtain a 6.67% annual payout on an annuity. That means for each $100k you spend on the annuity, you purchase $556 in guaranteed monthly income ($6672/year) for life.
At that rate, about $300k of your stash could buy enough guaranteed income to cover your $24k spend rate, and maybe $150k more could cover an increase of perhaps $12k to buy an ACA marketplace plan. If you spent $450k in this way, you'd still have $320,000 to leave in the market untouched for the next decade to cover inflation, longevity, emergencies, and eventual long-term care.
When Social Security kicks in you get a massive income boost that you might not even need. Some may complain about tax inefficiency, but I'm thinking of this as possible relief to any cash flow problems you might be developing by that time due to medical issues, the need to move, unexpectedly high inflation, home repair or remod needs, etc. Or it could replenish your portfolio if you had to tap into that in previous years. In other words, SS will mitigate most of the financial risks you can think of. And if the people are dumb enough to elect politicians who cut their own SS benefits then your income is still covered.
PLUS, you are essentially immune from Sequence of Returns Risk with this portfolio. A market crash could affect the value of your $320k but you can yawn and say "it'll go back up" because your income would be unaffected.
Retire whenever you're ready. It's a matter of clicking buttons on websites.
Replace the time spent on work with time spent among friends and in nature, and watch how the health issues and burnout improve. Take a hike, catch a live show, do yoga, join a volunteer organization, ride a bike, take a trip, make art, train for a 5k, work on the house, or do whatever else you find uplifting. Finances or risk are not holding you back.