I can't make the leading melody at all, any ideas?

I worked on the melody for weeks and i can't make one at all. i thought about the wrods, changed it million times, abut nothing it fitting. Maybe have any ideas/tips?

https://reddit.com/link/1itgv5d/video/4wfl65uaw5ke1/player

edited:

https://reddit.com/link/1itgv5d/video/rhx9wf5m0ske1/player

So, i tried my best