You have the payoff but too few ways to activate it.
Look for Tinker's Tote.
Tote supplies three untapped permanents. Two can pay Caparocti’s attack trigger while other creatures keep attacking.
Your synergy is already working but you keep falling behind.
Take an early play or answer before another expensive reward.
Choose your taps carefully: a creature tapped for Caparocti cannot also attack unless it was already declared as a vigilance attacker.
The support is missing
Favor castable creatures and interaction if narrow support does not arrive.