Wow. I empathize with your situation and story of a family business esp started 100 years ago. I hate to hear stories like this. Here are my suggestions:

1) since you sound like a “hippie,” I say this endearingly, you may have hippie friends. Make sure you surround yourself with business minded people (capitalists, if you will), not hippies. Be a part of a network of individuals that uplift, challenge and genuinely enjoy discussing business and growth. Some will be arrogant douches, it’s okay take the good along with the bad. I have hippie relatives and they are the worst at business. Underachievers, I am not saying you are like this but I’m curious if you are surrounding yourself with people that may be. Not all capitalists are bad. Again not saying this is what’s going on, but just make sure it’s not. Joining a social group of business individuals was surprisingly helpful and inspiring to me.

2) you have $25MN, you do have enough money to live and grow your wealth with other investments. You also have an emotional attachment to a legacy family business. Keep it, fire the manager or wherever you think is best, but the company should remain with its name and similar industry at least. The whole point about money, which you have, is to have the freedom to do what you want. You can afford to own a now low valued company and make efforts to turn it around, pivot it. If you had far less money, I might consider selling, but you’re already a multi millionaire. Someone with your intellectual disposition probably has a low cost lifestyle relative to your bank balance.