His failure was not including Washington insiders into his cabinet. It's the lesson that people often forget. The president can't be a total outsider and expect to be successful.
Remember when there was a crisis at a nuclear power plant, and the president rushed to the scene...to help, because he's a qualified nuclear engineer? I don't, I wasn't born yet when that happened.
It's not all roses and rainbows: Thatcher was a chemical engineer, and the only thing she engineered while in power was the downfall of England as a world power.
Honestly I feel like career politicians are part of the problem. We need people who have done other jobs and have experience outside of political circles. No more actors or reality stars though, I don't think this country could survive more of those lol.
I've already come to view Jimmy Carter as an unappreciated rockstar, and I didn't even know this story. I just Googled it for those interested. It doesn't seem like it was when he was president, but still completely badass/downright heroic.