How to optimize my game?

I’m using Blueprints. Optimization is bit new to me and somehow the performance is tanking even with Upscalers (tried all 3 - XeSS, FSR and DLSS).
The confusing point is NPC AnimBP and HairStrands stuff.
I’m using Metahumans as my NPCs. Any help would be great.
PS: This scene has no extra point light. Just the Directional light. I do gain performance when turning down the Global Illumination Quality but at times, it resets to EPIC for no reason. I do wanna sort the other bottlenecks first.

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