I bailed out when I was 56 and my financial situation was similar to OP's. I could've continue to work on an as-I-pleased basis for a few more years, but, based on what people in this good community had to say, felt it better to leave early. It was not planned - a fortuitous situation arose where megacorp gave me a nice package, which helped me pursue something without touching my FIRE budget and monies. I've now been out for 5 years, am single and live in a HCOL state, and yet my annual all-inclusive OPEX is running just above 40k.
One thing that helped me unplug without any pangs of regret was that, after a month of leaving megacorp, I went on a round-the-world trip whic lasted almost a year. Along with relocation from Asia back to the US, the travel and a new country every 2-3 months kept me busy. It was so much fun that I think I didn't have much time to miss the daily routine that I was so used to or have regrets about leaving early.
Lesson learned - to avoid ongoing questioning/doubt about whether letting go of professional work life is the right thing, find an activity or pursuit that'll keep you so busy that one doesn't have the time to second guess oneself. It was so exhilarating to do what I had wanted and liked to do, and in depth, that the whole hesitation/OMY game I was playing over and over in my head while still working felt so ridiculous.
Interestingly enough (having preached thusly!), my travel experiences led to learning a new language, which, after a couple of years, in turn led to a part time teaching job in a University abroad, which I took up to hasten language acquisition. While the work load is light enough, and enables me to live long term in the country as I hone my language skills, I'm beginning to think that this is absolutely the last time and there is no way, no how, no reason I'm going back to w*rk of any kind again. W*rk, however flexible, light, easy, etc. it may be, is still w*rk.
In summary, OP - find something you like to do for six months that'll keep you busy having fun. Trust yourself and everything else will follow.