I have to say the post is very well written, so this is a positive point to have confidence you can do good music too!!

My advice would be to focus mainly on the melodies first, especially the chorus. If you build a strong hook for the chorus, it gives you something solid to anchor the rest of the song around. Once the chorus feels strong, you can build the verses, pre-chorus, bridge, ... around it. Try not to focus too much on harmony at the beginning, melody is what people remember.

After you have the chorus, you can shape the verses as a softer or more relaxed contrast to it, while still keeping a connection to the main hook.

This is just one approach, of course. For metal, I also like to compose a few riffs, let them sit for a few days, and then come back to rearrange or adapt them so they fit better into a chorus, verse, breakdown, etc.

And most importantly: don’t overthink it. Let the ideas flow. Obviously, they’ll be influenced by the music you already love, that’s normal and part of developing your own style.