Instrumentation seems very easy for you, but in many songs I find it hard to make multiple parts while still keeping the melody intact. How did you find a way to use multiple instruments playing different parts, while still keeping the melody intact?
just try to not have too many different things happening at the exact same time. but you can stack some of the same things, or things that harmonize with the thing, and you can put different things in between the thing. if that makes sense