How do you improve at H2H?

Watch some H2H tutorials on YouTube, and read about positions and formations on sites like FIFAMobileGuide or others. Explore formations, read about players and their skills, etc.
I usually use 4-2-3-1 Narrow or False 9. Sometimes I’ll use 4-3-3A or 4-1-2-1-2 Narrow. It depends on the cards.
I’d have to see you play to say anything more. 
You can add me in the game (same IGN as on forums), and I could play a friendly or two if the times match up.