When I first decided I had to quit drinking the idle time on weekends was filled with boredom. Boredom was sometimes what caused me to drink. I just white knuckled it. After awhile I went from I can't do anything because I'm so bored, to I can DO anything because I am sober. Big difference.
But to answer your question, I started researching some things that interest me. For example I looked into this flat earth stuff. Its interesting. I also looked into how our history has been perverted in some cases. In other words I went in search of the truth.
You are 40? I started to rebuild at 47 so it can be done.