Increasing scale of entity model

I'm trying to find out how to increase the scale of an entity using the default biped model. I've seen this: https://mcreator.net/forum/73570/render-scaling-you-entities-matrixstack, but it doesn't seem to be applicable here. On 1.16, btw.

Here's the code in the Renderer.java file for the entity:

(if someone could tell me how to use an actual zombie model, that would also be nice, I've tried and my attempt didn't compile correctly)

@OnlyIn(Dist.CLIENT)

public class MediumZombieRenderer {

    public static class ModelRegisterHandler {

        @SubscribeEvent

        @OnlyIn(Dist.CLIENT)

        public void registerModels(ModelRegistryEvent event) {

            RenderingRegistry.registerEntityRenderingHandler(MediumZombieEntity.entity, renderManager -> {

                BipedRenderer customRender = new BipedRenderer(renderManager, new BipedModel(0), 0.5f) {

                    @Override

                    public ResourceLocation getEntityTexture(Entity entity) {

                        return new ResourceLocation("textures/entity/zombie/zombie.png");

                    }

                };

                customRender.addLayer(new BipedArmorLayer(customRender, new BipedModel(0.5f), new BipedModel(1)));



                return customRender;

            });

        }

    }

}