OP, I'm going to go in a different direction here. First of all, bravo for recognizing early on you wanted freedom and control over your life. Bravo as well for setting an ambitious goal and then achieving it. What this all says to me is not that you need to get back into the rat race, but that you need a new hill to climb. You don't need counselling/coaching or networking or local chamber of commerce membership - you need a Ph.D. Or you need to open a second business restoring classic muscle cars and build it into something real. Or you need to move to Spain, study Renaissance art and write a book. Or you need to hike across Africa blogging about it. And so on.
To be clear, I'm not talking busybody work which distracts you from some free-floating existential dread. I'm talking about setting a challenging, meaningful goal for yourself and then accomplishing it. What do you really want to do in life? Who do you really want to be? Do you deep down wish you spoke three languages? Or went to law school (er, don't, my advice)? Or became the CEO of a worthwhile charity? Then that's your Point B and you are at Point A now. Your business gives you a baseline income and stability from which you can pursue those other goals. Reading your original post, it just jumped out at me that you seem to be a goal-oriented person (I am as well) and everything you describe seems to me to be related to not having clear goals right now.
That kind of big goal setting will accomplish many other things too. It will get you in contact with like-minded people, including potential significant others, mentors, friends and colleagues. It will give you a sense of purpose and drive for the other 30-50 hours a week you might want to be working. It will help you feel you are not just filling time as a partially-retired person.
So, go get a black belt, your sommelier license, get your Japanese up to par and become a real estate agent. Just get going!! I'm frankly envious because I can't get out of the rat race for several more years and every single thing I listed above appeals to me, if only I had the time and financial foundation. You do - time to reap the rewards of your labours.
Keep us posted.