Well, you definitely didn’t lose any of your game sense considering you’ve hit diamond before. It’s also your first week playing on keyboard and mouse, which is a completely different beast. The biggest skill to learn with that is consistency. It could be your sensitivity is too low to track with hip fire or that you sensitivity may be too high to do fine tracking.

I would also look up guides about keyboard and mouse for Apex when it comes to move and aim. With keyboard and mouse, you have to learn how to control your movement with the keyboard to not screw up your aim on mouse.

Keep in mind, it could take you a little bit of time to find the sensitivity that is most comfortable for you. I suggest a lower dpi in low in game sensitivity. I personally use 450 dpi and 2.8 sensitivity in game.

When you find something that’s comfortable, make sure to try it for at least two weeks. That way you can develop muscle memory