Here is something easy to do and has an almost immediate impact on your life

The last thing you do before going to bed , say to yourself “ Tomorrow is going to be a great day.
Then the first thing you do when you wake up, say to yourself and or to the first person you see “Today is going to be a great day”
You will still have bad days, sorry nothing is for sure, But I bet you that you will start to see more and more good days.