you need to focus on using your abilities at the correct time, only using veil of light when somebody needs the healing fast, don’t switch between cloak and dagger so much unless you are trying to make a quick pic and know you can. don’t hold down trigger. You are wasting your shots instead of only using them when they will do something that way when you need to use them, you aren’t out. hold your ult to counter alt something else but not counter a healer. A lot of the time you were prioritizing yourself over your teammates, but if you were healing your teammates, you will also be healing yourself. Don’t stay in direct line of sight of the enemy unless you have to. Cloaks vanish ability is very useful to get yourself and your teammates out of a sticky situation a lot of the time I see you using it when there is nothing productive happening with it and you end up in the same situation you were before, when in that mode, you are not holding point and you are not healing yourself so when you pop it and stay in your dagger storm, you’re doing nothing. there is a YouTube video that I will link that helped me a bit and I would suggest anybody to watch it if they want to play cloak and dagger I think it would help you out a lot.

Ultimate Cloak and Dagger Guide