This is difficult to write. It doesn't seem real.
I have reached FI by any reasonable measure. My current spending (excluding tax) is under 2.5%, in one of the most HCOL cities in the world (Hong Kong). The biggest jump was some months back after selling my apartment; I wasn't including the value in my stash because of how volatile the real estate market here is. The market run-up over the past months since then, and especially the past month, has pushed my stash over the $2 million mark.
I will probably RE some time this year, but I think the biggest obstacle is that this doesn't feel real. Hopefully this is just because of how quickly the last jump in the stash happened; if I remember correctly I was still slightly over 4% spend before selling the apartment, which was a sizable chunk of my net worth after doubling in seven years (the property market here is insane). I dumped most of the money from the sale into VTSAX/VTIAX some months back and we have seen what the market has done since then. Before that point, I was steadily approaching FI through a combination of a good income and keeping my expenses in check (the original motivation being a career I absolutely loathed, but which I mostly transitioned away from around 1.5 years ago).
I'm still trying to wrap my head around the situation and feel more stress about it than I should; it's probably at least partly some kind of fear that the market will crash tomorrow. From August to November I started to have the occasional moment of peace and joy, like it WAS starting to feel real, but I think this went away as the market pushed closer to the $2m mark, so I was feeling the "push" again that I am so conditioned to. I'm not sure.
I have a three-month notice period in my job, and would think about starting that at the end of March. I will be visiting home in California for most of March, and will be thinking hard about whether to move back there, or stay here for some time longer. The end of March also happens to be bonus time; though that means less than it would have a year ago, it was a target to "stick it out" to and would likely be a month's salary.
I also turn 40 this summer, so timing-wise that would fit too. I'm just not sure how to get myself mentally into a place to pull the plug completely. It probably doesn't help that I don't really know anyone personally who has been in a position to FIRE (am also single, no kids). I don't think I will fall into OMY syndrome anymore (though I arguably did the past year or two), but I can see "One More Month" syndrome still possible at this point.
It would be great to hear how anyone in a similar position was able to mentally/emotionally prepare to cross the bridge. I was feeling stuck working on my IPS/AA, and this post is what came out instead.
*EDIT* - I'm not worried about not having enough to do/how to spend my time. I have hobbies that I enjoy very much and keep me physically active.