Your child is a loving and beautiful human being. At this stage, his mind is dynamic, leaving enough room for you to shape his morals perfectly. You, as a parent want them to become better persons and there's no better way than moulding them to become good individuals by demonstrating good acts of kindness and humbleness by yourself.
What you need to do
For instance, you can create an artwork with the child to help them learn about different responsibilities, such as sharing and spreading love. You can use puppets to teach them courteous etiquettes, such as covering the mouth when they sneeze, wiping their nose with a tissue etc. to teach your child about forgiveness, you can play different games. Or else, create homemade place mats for the dining table and show them how they can use those mats and place them properly.
If you want your child to learn kindness, prompt them to hand out old toys and clothes to underprivileged kids. Make sure that you do this under supervision so that your child learns to be kind while staying safe. Otherwise, you can wrap small gifts and play make-believe games of giving and receiving presents to teach your child gratitude. You can use games to teach kind words and good behavior, rectifying the child if they speak something wrong.