IT. We've also got our own business. We're in quite a niche area. Which means that we've only got skills roughly 8 other people have.
We also invested in property. That helped in the beginning. Before the business.
Though as someone said. Aim to be happy. I've actually found that because I am so happy and was before the money. That nothing phases me. Nothing knocks me down. Nothing makes me sad or down or makes me grumpy. I find it a huge help in the business world too. People love happiness