To use optifine shaders remove:
bmvsb-1.0.2.jar
dynamiclightsreforged-mc1.16.5_v1.0.1.jar
helium-1.0.jar
magnesium_extras-mc1.16.5_v1.3.1.jar
magnesium-1.5.jar
Distant-Horizons_1.16.5-a1.5.4