I made a promise to myself to end my life once the things I enjoy end
Why would you end your life?
Because I don't enjoy anything else anymore
If you need help then it's okay to reach out for it. Therapy can help you find new things to enjoy. I know there are many things out there still left to discover.
There is nothing much to discover. I'm alone in a desert of shit and I'm aware of what gives me happiness.
If you are aware that your happiness will run out then you should reach out to professional help. There are still plenty of things to discover in your life. Claiming you know everything that makes you happy is short sighted.