Not Saying Amen
I'm not a 'morning person' so it was a bit difficult, but I managed it for several days. But I realised that it wasn't helpful for me to end my prayers with the word "Amen" when I did this.
This was because I was struggling to stay focused on the task (due to still being quite sleepy) and saying "Amen" when I finished praying was starting to feel like I was finished with the 'talking to God time' in my day and moving on to everything else.
This was obviously not the right way to think of life. God is with me all the time, and I generally aim to pray as soon as I feel like I have something to pray about. Jesus made it clear that we don't need special places or times to talk to Him.
But while the word "Amen" is a useful indicator for finishing a prayer when you are praying with a group of people, it turned out to be unhelpful when I prayed in private. It was like me saying "Goodbye!" to somebody I wasn't actually leaving. So I stopped using it.