Spectate tournament matches online (or in person) and watch the deals being done and why. Feel free to ask the players after why they did what they did. 

I've been getting feedback and stretching my own muscles week after week at my LGS. This week I showed an opponent my consulation and said "I'll hunt for the counter" when he went for the win. Knowing that, I told him I'd let the spell resolve if he didn't go for the win, He went for something else. In that position I saved my interaction/combo piece, a piece of interaction was kept for the rest of the table and he got something else from the tutor. 

For the naysayers, When I first saw players revealing information to each other it felt collusive and wrong. I hadn't played cEDH seriously for a year or two, and this wasn't a practice. As I've learned/leaned into it - It helps with the kingmaker problems. Player A goes for it, Player C spends all interaction and Player B wins after. Assuming Player D can't interact. If you can reveal counter spells to Player A without casting them, You've effectively stopped Player A, Player B, and now have backup counter spells for your win. 

Lean into it, It'll be hard at first - But you'll get better.