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Tailoring light–matter interactions in atomically thin transition metal dichalcogenides (TMDs) is a subject of considerable current interest to unveil the physics of exciton dynamics in these systems. Here, we report our findings on the selective enhancement of exciton emission by coupling hBN encapsulated monolayer WSe₂ to plasmonic nanocavities. Our nanocavities, formed by a small gap between a flat gold surface and a gold nanocube, support a strong out-of-plane electric field enhancement. hBN encapsulated monolayer WSe₂ embedded in the nanocavity is shown to exhibit rich excitonic states at low temperature. Based on the plasmonic cavity geometry, we can selectively enhance exciton emission and study their unique dynamics. The possible mechanisms underlying these unusual light-matter interactions are unveiled through the assistance of tunable electric doping and magnetic field bias. Our results provide new progress on the understanding of exciton-plasmon interactions in 2D TMDs, paving the way for applications in novel optoelectronic devices.