Much of the advice around choosing a career when you’re just starting out still applies if you want to make a radical career change later on in your working life.
For starters, you need to be clear about your values. If you don’t get a proper handle on what really matters to you, you are likely to make the same choices that led you down your current career path that, as it turns out, was never quite right for you in the first place. You also need to review what you’re good at, what you like and the way you like to do things, because your interests and preferences change with your experiences as you get older.
Then, you need to do your research into careers you think you might be interested in.