It's hard to give you any advice because it always depends on many things. For some people it's about a few bad habits. For a lot of people it's about their job

It's hard to give you any advice because it always depends on many things. For some people it's about a few bad habits. For a lot of people it's about their job. For others it might be about their role and responsibilities, or their lifestyle, or the environment and people around them. What you need is a good listener/friend to debug it together. Perhaps you can track it down. It usually doesn't happen overnight. So you may be able to tell when it has started and what has changed in your life before that.