You have the payoff but too few ways to activate it.
Look for Duel Tactics.
Both the first cast and a later flashback of Duel Tactics can trigger Poet, while preventing a blocker from getting in the way.
Your synergy is already working but you keep falling behind.
Take an early play or answer before another expensive reward.
Spells that target only a player do not trigger repartee. Count the creature-targeting modes you can actually use.
The support is missing
Favor castable creatures and interaction if narrow support does not arrive.