One of the hardest decisions to make when you compose, or write songs (depending upon how you view the process…!), is really fundamental. It's not about techniques, chords, harmonies, modes, scales and other processes…
…it's about what you want your music to sound like.
I think this is the same whether you are a "classical" composer or a song-writer.
I see two main ways you can arrive at satisfactory points with finding your sound.
Firstly, discover other artists, bands, composers etc. who create a similar sound to the sound you want to achieve (it sounds like you have a good idea already!) Listen to them. Read their scores. Read their lyrics. Play their music. This will give you an insight into how their music works. But, also ask other musicians you know, "How did this artist create this sound?; What is this chord sequence they wrote?; Why does this melody work (or what does it do)?; How did they perform/record this?".
Secondly, Experiment. Noodle. Improvise. See where your fingers take you on your instrument. But do this using your ears. All the time you should be asking yourself, "Have I discovered something closer to the sound I want to create? Or, have I discovered something unexpected that excites me, and makes me want to compose more music like this?"
But, this is quite abstract…
How about I suggest some more specific approaches:
- play songs by bands, artists, composers you are interested in (and want to take influence from) - get their music under you fingers, and into your ears.
- try yourself to be analytical: What is it you most enjoy about their music?; Are there any short musical ideas or characteristics that seem to recur in their music?; If you had to tell another person (musician or otherwise) what the best "bit" from a song you like is, how would you explain it?
These approaches will give you a broader understanding of the sound of the music you are interested in, and suggest ways to emulate, vary and (hopefully) move beyond your influences.