this is about your lowpoly beeing dirty and having lots of intersecting geo where it isnt needed like pior said, make a cleaner lowpoly and explode only what is needed.
Your lowpoly looks very strange, it seems like you created floating parts in places you really didnt need them. Also some unnecessary loops. I'd be tempted to ask you to post your HP to see how different artists would tackle the low. But given that its a rather polished asset it would feel a bit awkward ...
Can you post the normal map itself. The ares you highlighted in red being flat surfaces should make it easy enough to just paint out hat little crease. And actually it could be caused by the lowpoly. What is going on here, is the green portion a separate mesh that is just sitting right above the blue portion? And why are…
You've got a lot of inaccuracies here from the concept, nearly all of the things that make the concept look good have been misrepresented in the model. You've got boring, hard shapes where you should have nice curves, uniformly hard edges on nearly every surface where you should have a wide variety of edge softness, and…