I'm 41. 2 young kids. So similar in that way. I'm not retired yet but fairly safely FI.
I think your transitional approach is a smart move. I've done a bit here... buy not much... certainly nowhere near covering monthly costs and part of that is just procrastination
... OK... part = 95%. So if you've done that it sounds like you're in good shape.
Wish you the best on your next adventure! Don't think too much about guilt. I'm sure the company will survive without you and I'm sure if they didn't need you anymore the guilt wouldn't be enough to keep the paycheck flowing
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