Look for careers where the daily work is something that seems interesting. Don't get too distracted focusing on salaries or impressing other people with your job. The more you enjoy the work, the easier it is to be happy and successful.
Your other priority should be to find people you enjoy working with. Finding people you enjoy being around. If you get stuck with toxic people who drain your energy or make you feel bad at the end of every day, you need to move to another job or even new city. Stay away from very negative people and don't get pulled into online cynicism spirals (Reddit, Twitter, even HN are full of this). Gravitate toward people who are happy in their own lives and spend less time with people (or internet comments) from people who are unhappy.
Don't get attached to an idea that there's one perfect career for you. Learn to enjoy doing work with people you like to be around and you will find that you can be happy doing a lot of different things.