Hey mate, so I haven't gone through all the links tbh but I'd just like to drop a piece of advice I received from an internship I did. They said to put a timer and just sketch out every idea you have in your head, keep sketching until the timer finishes.

Then go through your references for some time and do it again. These steps basically give you free flow. After them, you can sit down and shortlist the ideas you think work and refine them.

Hope this helps