@maxtortion So, I gave your feedback a lot of thought and I tweaked my deck and played again. I played the same person twice. The first time I lost 2-0 and the second time I won 2-0.
My interaction with the player did not show me why I lost the first time and won the second time. I may have had more patience or I simply knew what he was playing.
How do I use this experience to get better?
What plays were made that caused you to lose the first match? Did you overcommit into countermagic? Could you have played around something that you didn't play around?
What plays were made that caused you to win the second match?
What cards seemed pivotal in both sides of the matchup?
What cards were most effective to help your opponent win the first match?
What cards were most effective to help you win the second match?
In general, what cards were most scary from your opponent?
What cards do you have that best answers the scary cards /plays from your opponent?
These are the kinds of questions you can ask yourself in order to learn from the matches.