Have you tried talking to your wife about a change of income? Becoming a guitar teacher would be a wonderful career and give you riches money can’t buy. It might be disappointing at first for the family to adjust to a different financial situation. But having a happier and more present dad/husband will be worth it. By the sounds of it you’re ready to implode anyway. So it’s better to make the change in a controlled manner than with a sudden influx of pressure.