You can add fried edible gum to add crunchiness to the halwa(Edible Gum is a natural edible gum. It provides heat to the body and is usually eaten in cold winter).
You can add grated khoya / mawa to the carrot halwa to make it richer.
You can replace condensed milk fully with sugar to taste but in that case add double cream.
Cool completely and chill if you want to serve it cold or set into a baking tray cut them into pieces like burfi.