AddTitle.cs

namespace Website.Pipelines
{
    public class AddTitle : GetRendererProcessor
    {
        public override void Process(GetRendererArgs args)
        {
            ....
            
            args.Result = new WrapperViewRenderer(args.Result)
            {
                Model = model,
                Rendering = args.Rendering,
                ViewPath = "/Views/WrapperRendering.cshtml"
            };
        }
    }
}

WrapperViewRenderer.cs

namespace Website.Renderers
{
    using Sitecore.Mvc.Presentation;

    /// <summary>
    /// This WrapperViewRenderer can be used in pipelines which renders markup arround existing renderings (https://ctor.io/wrapping-a-view-rendering-to-automatically-add-additional-markup/).
    /// The problem with the approach described in the blog post is, that the cache key will be wrong for personalized elements
    /// when they are hidden by personalization. 
    /// </summary>
    /// <seealso cref="Sitecore.Mvc.Presentation.ViewRenderer" />
    public class WrapperViewRenderer : ViewRenderer
    {
        private readonly Renderer innerRenderer;
        public WrapperViewRenderer(Renderer innerRenderer)
        {
            this.innerRenderer = innerRenderer;
        }

        public override string CacheKey
        {
            get { return this.innerRenderer.CacheKey; }
        }
    }
}