No is a complete sentence and so often we forget that.
When we don't want to do something we can simply smile and say no.
We don't have to explain ourselves, we can just say "No".
Early on my journey I found developing the ability to say no expanded my ability to say yes and really mean it.
My early attempts at saying no were often far from graceful but with practice even my no came from a place of love.
Love yourself enough to be able to say yes or no.