You have the payoff but too few ways to activate it.
Look for Poisoner's Apprentice.
Attack with the Pest on a later turn to gain life, then play Apprentice in the second main phase for its removal trigger.
Your synergy is already working but you keep falling behind.
Take an early play or answer before another expensive reward.
These Pest tokens gain life when attacking, unlike the original Strixhaven tokens. Having a Pest does not itself enable infusion.
The support is missing
Favor castable creatures and interaction if narrow support does not arrive.