Earlier quoted context omitted.
Honest question: why not leave FAANG/SV, take a relaxed remote job of maybe 30h/week and live in a low-cost, warm and cosy Mediterranean city (since you mentioned you're from Europe that shouldn't be a problem)?
That’s the tentative plan once I’ll reach my target number :-)
I'm thinking 3M in invested assets should do. If properly diversified (real estate + stock) that should be sufficient to generate about 90k/year of passive income.