How can I convert T into an instance of an object?

I am trying to keep this method as generic as possible. I am passing in a dynamic class. I want to create an instance of that class so that I can return it back to my controller. I am stuck on creating the instance. Here is what I have so far

This is how I call it from my controller

       public async Task<IActionResult> GetClassById(Guid id)
        {
            return Ok(await _contribRepo.Get<MyModelClass>(id));
        }

Here are the methods that take in a class type of T and send back the type T back to my controller

       public async Task<T> Get<T>(Guid id) where T : class
        {
            
            var component = CommonHelper.GetAssemblyNameContainingType(default(T)); 
            using (var connection = new SqlConnection(_connectionString))
            {
                await connection.OpenAsync();
                component = await connection.GetAsync<T>(id);
            }

            return component;
        }


public static object GetAssemblyNameContainingType<T>(T? typeName) where T : class
        {
           
            var type = Assembly.GetExecutingAssembly()
                    .GetTypes()
                    .FirstOrDefault(x => x.Name == typeName.ToString()); <----typeName is null
            var obj = Activator.CreateInstance(type);

            return obj;
        }