A good home remedy for making hair thicker is to take an egg yolk and mix the egg yolk with one tablespoon of hair oil and two tablespoons of water.
You can use any hair oil that you like to use since it doesn't matter. Mix the egg yolk, hair oil and water together and massage this mixture into your hair once per week and after a few weeks your hair should begin to get thicker.
This has worked for me to make my hair thicker and if you do it at least once per week your hair should be thicker as well.