Someone once asked...
Someone answered with kindness...
Because of dopamine, the motivation neurotransmitter. Without it, you would not be able to get out of bed in the morning.
Another soul answered...
There is no meaning outside of your own mind, its up to you to build it. Construct a world without meaning, your life is meaningless. Build a life around meaning, and feel it return to you.
Another soul answered...
if there is no purpose then why not