

The US founding fathers decided that the president has to be at least 35, which to me implies that those individuals have had some political experience before becoming president. IMO roughly half the Senate should be under 35, and a good chunk of the House of Representatives should be under 29 considering Senate terms are 6-years long.
Not that you should have to be a “career politician” before becoming president, but it’s fairly common to want to show some experience at leadership/politics.
I’m not really a fan, but look at “Mayor” Pete Buttigeg. One of the biggest attacks against him when he ran was “being president is not the same as being a mayor” (meanwhile we’ll elect CEOs like their experience means anything, but that’s a whole other problem).
You could go the evil route and become a hitman as well, or rather a shitman, turning your targets into poo.