How to make 4-note trap main melodies? (Like Patek Water & Ocean Drive)

I've been trying to make 4-note trap melodies in the past couple days but they always sound bad.

I wanted to make main melodies like the ones you hear in Patek Water, Ocean Drive and 7-Min Freestyle.

I don't know why those melodies sound good and mine sounds bad so i figured i will post videos of them playing in the piano roll along with the scale used in each so you can enlighten me (Music Theory-wise) on why my melodies sound bad and those songs i mentioned sound good and tell me what is the correct way or process of making that type of melody.

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