start with some simple detail stuff like putting gray lines under your black lines and stuff like that or if you need some help collab with someone
This is just completely untrue. A smooth track is a track that is played smoothly, usually a jumps track, or a well made track that has been tested thoroughly. a smooth track will be made to specifically limit difficulty and will almost always have very few deaths if made well. An offroad track is usually a sub category of trial, that incorporates rough terrain into a challenging ride. Offroad tracks are made to be a challenge and will most likely have lesser completions than a smooth track. an offroad track is not a type of detail, it's a type of trial. A smooth-offroad would combine features from both, usually it would have a rough ground, but when riding it, it will feel smooth because it's been made to be played smoothly. essentially it's a normal smooth track that's slightly bumpy or blends into the rough terrain that isn't ridden on. You can tell the difference by noticing if you're playing an offroad and it feels easy, or is you're playing and offroad and it feels hard. that's all there is to it.
can you screenshot the most detailed part. I am not an expert but I think that just the track itself with no detail is not feat worthy. Earlier you said it has detailed. Can you show the part with the most detail?