How to get rid off constant sadness?

you dont. this isn't meant to be a discouraging statement. i live in a desert, and the question to "how do i get rid of constant heat" doesn't have an answer, like " just stop being hot" or "try to think cold". when you have depression, you can treat it as a problem, with a solution, but never the idea of a permanent solution. air conditioning needs fuel. happiness need work. find something you can monitor and make effort to maintain. if you find nothing you have on hand fills the requirement , then search for the next piece, as humanity is more jigsaw, and less tetris