Be careful that your "last in" purchases have been held long enough to qualify for long-term instead of short-term capital gains.
I do not have any hands-on experience with this so take my thoughts with a huge grain of salt, but I have been working on a spreadsheet that includes withdrawal strategies, so I'm going to take a stab at this and I welcome any corrections:
Your LTCG rate is 0% if your taxable income is less than $44k for single and $89k for married couples.
https://www.irs.gov/taxtopics/tc409#This means you can take that number + the standard deduction out of your brokerage each year without paying any tax. For 2024, that's $44,625 + $14,600 = $59,225 for a single filer, or $89,250 + $29,200 = $118,450 for a married couple. Pulling these amounts out of a brokerage will result in $0 taxable income. (If you're going to itemize in retirement you'll have to do the math yourself.)
Those high standard deductions are going to expire in 2026, so expect them to revert to roughly half their current value, giving you
approximately $52k single or $103k married to work with.
I think you should be fine if you spend lower than this amount annually. You've missed out on tax savings while you were earning, but if you've gotten this far anyway that's just water under the bridge. If you want to spend more than this amount, you'll start paying the 15% LTCG rate on brokerage withdrawals over these numbers.
If you want to qualify for the ACA instead of Medicaid, you may have an issue because you'll need a certain amount of taxable income for that, but that's the extent of my knowledge on that subject.