Tell HN: I want out
You're probably overestimating peoples' reactions to you leaving.  Business owners manage to simultaneously believe the business is beyond their control and yet hanging on their every word.  They can't both be true, right?  If you left tomorrow, odds are a successful business continues, and it will be one which wouldn't have existed but for you.That said: what stops you from having an all-hands meeting and saying "Is this REALLY what we want?"  If it isn't, it is your business.  Change it.  Client needs to be able to text you at 8 PM?  Client will be assisted in finding a more appropriate service provider.  Employee feels that nobody can go home at 6?  Employee gets told by his boss "Go home.  It will be here tomorrow.  There are companies that pull all-nighters every day.  This is not one of them."Also: raise your rates.