Dear OP where do i even begin
First off... you play heimer MAYBE once every 5 games, so youre someone who casually plays heimer
second... you have the SAME EXACT BUILD PATH in every game with him... regardless of lane opponent... you literally ALWAYS BUILD THE SAME ITEMS
The fact that you think abyssal, zhonya, and morellos are the 3 core heimer items to buy just proves you know nothing about this champion.
Also youre probably one of those guys who doesnt realise in team fights that ult + E is far supperior to ult + Q or ult + W
maybe you should learn a champion thoroughly before speaking about them. give it a try