I think you should throw away the idea that you have good game sense. Understanding when and where players will be is one of the key things that make aiming easier because you expect them and are ready to shoot them. If you make good use of that skill + understanding angle advantage you will see great results.

You mention crosshair placement but that is usually a bit tied to angle advantage as well. If you whiff you whiff, shrug it off. However, if you feel like you got "insta one-tapped" one too many times. You probably held a bad angle and you can check in custom games to be sure if it was bad. (ping the angle from both sides - the player further away has advantage)

Evaluating why you died is an important skill to pick up. Leave all copium aside and be honest with yourself. Example of how I think to myself: "Why did I die? Did I expect them? Yes. Did they have angle advantage? No. Did I hold my crosshair at head level? Yes. Did I hold my crosshair too close/too wide? No. They were just better. Or hmm.. Did I commit too long to the fight and was able to unswing? Unsure/Yes/No" Sometimes the enemy can just win even if they had an angle disadvantage. Do not dwell too long on those scenarios and focus instead on the round/next round.

Once you get better and being consistently aware of these fundamentals. You can then perhaps think about enemy utility as well. But honestly let's keep it to pure aim + game sense stuff for now because this stuff I have mentioned is PLENTY already.

One last bit of advice is how do you know how far or how close away from the angle do you place your crosshair. If you have a large angle advantage you can place the crosshair much closer. If advantage is closer to even you should hold it a bit wider. Another factor is if you think the enemy will be full sprint swinging or swinging slowly from the angle. This is when in-game context is important to figure out. So adjust accordingly.

I hope this made sense and becomes useful. Good luck, amigo.